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If you’re wondering, “What is an API?” you may not have heard the term before. Or perhaps you have a vague idea of what an API is or some understanding of what they do. In either case, we’re here to help: let’s dive in.API definition
API stands for Application Programming Interface. In basic terms, APIs are a set of functions and procedures that allow for the creation of applications. They access the data and features of other applications, services, or operating systems.
Essentially, they’re a go-between for different software platforms. They allow two unrelated applications to “talk” to each other.
For example, let’s say you’re a stockbroker, knee-deep in the financial markets and trading. An API may link a set of automated trading algorithms to the trader’s preferred trading broker platform. This allows you (the trader) to see real-time quotes and price data or conduct electronic trades.
Good APIs make it easier to develop a computer program by providing all the building blocks, which are then put together by the programmer. In fact, APIs are often compared to Legos for this reason, because you can mix and match and reuse them infinitely to build new services.So, what is an API exactly?
Let’s get down to it and go deeper and pick it apart:
First of all, the API is not the database or even the server; it’s the code that governs the server’s access point(s). An API is like a common language, a communications mechanism between developers.Here’s another real-world example
Another real-world example of API use is buying movie tickets online. You go to the movie site; you enter your movie, name, and credit card information, and lo-and-behold, you print out your tickets.
But have you asked yourself what’s going on between entering your information to receiving your ticket? APIs, that’s what! They are the glue of the digital world, collaborating behind the scenes with other applications, making “calls” to each other to deliver data that’s needed as requested.
This type of integration is called “seamless” because you never know when a software role passes from one application to another.
One useful analogy is to think of APIs as a hotel concierge. When you stay at a hotel and need something – especially in the days before Yelp reviews – you would speak to the concierge to get connected.
This could be something internal provided by the hotel, like dinner reservations at the hotel restaurant, or external like golf or theater tickets. The concierge simplifies your access to these different services.
APIs are essentially the concierge of the digital world — they enable businesses to speak the same language, and they power the global digital economy.Why do we need an API?
Imagine the following scenario: You (as in, your application, or your client, say a web browser or mobile app) want to access another app’s data or functionality.
Perhaps you want to access all tweets that mention the #jimmychoo hashtag. You could email Twitter and ask for a spreadsheet of all these tweets. But then you’d have to find a way to import that spreadsheet into your application. It’s not a very efficient way to get the job done.
Why? Even if you stored them in a database, as we have been, the data would become outdated very quickly. It would be impossible to keep it up to date.
It would be better and simpler for Twitter to provide you a way to query their application to get that data so that you can view or use it in your application. It would stay up to date automatically that way.
The API provides access to data, so this data can be included in different applications. Instead of attempting to format a big file in a local application to extract a little bit of data, an API delivers the data you’re looking for without needing additional investigation or manipulation. It’s a much more efficient way to find the information you’re seeking and plug it in.History of APIs: SOAP XML V/S REST JSON APIs
So, where did APIs originate? It depends on who you ask. Salesforce.com launched the first online API on February 7th, 2000, according to the API Evangelist. But the Salesforce APIs were not intended to be made public.
It’s also been said that eBay started creating them for their own use that same year. So, Salesforce and eBay are often given credit for introducing the oldest APIs in history, but the story doesn’t begin there.
During the 2000s, SOAP Services were leveraged for some of the same use cases… and then Roy T. Fielding came along.Who Is Roy T. Fielding?
At the same time all of this was going on (in 2000), Roy Fielding introduced what we know as modern web APIs, with his dissertation, “Architectural Styles and the Design of Network-based Software Architectures.” Other forms were developed later, producing a whole new industry of online social and corporate collaborations.
Fielding is a computer scientist and a prominent figure in the networked software industry. As a graduate student at the University of California Irvine, Fielding invented a robot for the web called MOMspider for a class project. You can easily tell he wasn’t a typical student.
After that, he came up with some of the underlying principles for developing the WWW, which he originally called the “HTTP Object Model,” but later renamed it while working on his Ph.D. He decided to call it Representational State Transfer or “REST.”
REST provides a lighter-weight alternative to SOAP. Many developers found SOAP cumbersome and hard to use. REST is easy to understand, and it’s simple to write and document. As Roy Fielding himself put it, “REST was originally created to solve my problem: how do I improve HTTP without breaking the Web?”
This ease of use also makes it easy for other developers to understand and write applications.
REST makes efficient use of bandwidth, as it’s much less verbose than SOAP. It supports many data formats, but the predominant use of JSON means better support for browser clients.
Neat. This is fairly easy to read — our data is stored as key/value pairs. This means we can see the key on the left and the value on the right. The key stays the same for each restaurant object, but the value would be different.
A different restaurant would have a different address, but its properties would be the same — it would always have a name, address, zip, phone, and email.
This means that an API that returns JSON can be accessed by an application written in Java, Ruby, Python, JS, PHP, etc. This makes APIs developer-friendly, highly scalable, and platform-independent.
Aha! Scalable! Platform Independent! Good words, powerful words, $$ words.
With developer buy-in, APIs started exploding in importance, and organizations began leveraging them with great success. So much so that APIs became a strategic necessity for businesses.Who creates these APIs?
Large tech companies, especially social media companies, frequently make their aggregate data available to the public. Stripe, Twilio, Twitter, and Slack are some well-known examples of companies that leverage APIs for their interactions.
But it’s not just digital natives and social media companies. APIs are also maintained by government organizations, banks, healthcare organizations, conferences, publishing houses, software startups, manufacturing companies, eSports leagues, and even individuals. They share anything from social media content to trivia questions, rankings, maps, song lyrics, recipes, parts lists, and more.
It’s been said that APIs are aiding the democratization of data, and they certainly have the potential to put people back in control of their data and at the center of the ecosystems that serve them. APIs enable Open Banking, Open Healthcare, and could eventually lead to “Open Everything.”APIs are everywhere
Here’s an example of what happens in an internet minute.
So many of these interactions are made possible by APIs, which explains why they’ve grown enormously popular in recent years. As I mentioned earlier, they offer simplicity and efficiency, but a couple of other critical changes in the industry helped grow their popularity.
These days, an API’s speed, extended reach, and 3rd party integrations make them key business drivers. Throw in their ability to be customized to fit any developer’s needs, and you can see why they’re everywhere.Types of APIs
Designing, implementing, and maintaining APIs for the Web is critical to many companies’ business models. And one API doesn’t fit all. There are four main types of APIs that are often used (of course, there are more):
Here’s what you need to remember about APIs:
Here at Axway, we know APIs are the building blocks of modern business, so we’ve designed the Amplify API Management Platform to automate their discovery and management. Because it functions as a focused server that regulates traffic, an API gateway is a required component of a secure API architecture.
The only open, independent platform for governing APIs across teams, the hybrid cloud, and third-party ecosystems, Amplify lets you manage your API services and simplifies API production and consumption, so organizations can focus on what they do best.
Download our Digital transformation survival guide to learn how businesses are embracing APIs in their digital transformation to improve customer experience, drive innovation, and open up to partners.
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