What is an API and SDK?

API is an interface that allows software programs to interact with each other, whereas a SDK is a set of tools that can be used to develop software applications targeting a specific platform.
SDK? – A software development kit (SDK or “devkit”) is typically a set of software development tools that allows the creation of applications for a certain software package, software framework, hardware platform, computer system, video game console, operating system, or similar development platform.

What is a mobile SDK?  –  Short for software development kit, a programming package that enables a programmer to develop applications for a specific platform. Typically an SDKincludes one or more APIs, programming tools, and documentation

 What is the use of Android SDK?  –  A software development kit that enables developers to create applications for theAndroid platform. The Android SDK includes sample projects with source code, development tools, an emulator, and required libraries to build Android applications.

What is the Java SDK?  –  The JDK forms an extended subset of a software development kit (SDK). It includes “tools for developing, debugging, and monitoring Java applications”. Oracle strongly suggests to now use the term JDK to refer to the Java SE Development Kit.
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API – application program interface

API, an abbreviation of application program interface, is a set of routines, protocols, and tools for building software applications. The API specifies how software components should interact and APIs are used when programming graphical user interface (GUI) components.  A good API makes it easier to develop a program by providing all the building blocks. A programmer then puts the blocks together.

Types of APIs

There are many different types of APIs for operating systems, applications or for websites. Windows, for example, has many API sets that are used by system hardware and applications — when you copy and paste text from one application to another, it is the API that allows that to work.

Most operating environments, such as MS-Windows, provide an API so that programmers can write applications consistent with the operating environment. Today, APIs are also specified by websites. For example, Amazon or eBay APIs allow developers to use the existing retail infrastructure to create specialized web stores. Third-party software developers also use Web APIs to create software solutions for end-users.

Popular API Examples

Programmable Web, a site that tracks more than 13,000 APIs, lists Google Maps, Twitter, YouTube, Flickr and Amazon Product Advertising as some of the the most popular APIs. The following list contains several examples of popular APIs:

1. Google Maps API: Google Maps APIs lets developers embed Google Maps on webpages using a JavaScript or Flash interface. The Google Maps API is designed to work on mobile devices and desktop browsers.

2. YouTube APIs: YouTube API: Google’s APIs lets developers integrate YouTube videos and functionality into websites or applications. YouTube APIs include the YouTube Analytics API, YouTube Data API, YouTube Live Streaming API, YouTube Player APIs and others.

3. Flickr API: The Flickr API is used by developers to access the Flick photo sharing community data. The Flickr API consists of a set of callable methods, and some API endpoints.

4. Twitter APIs: Twitter offers two APIs. The REST API allows developers to access core Twitter data and the Search API provides methods for developers to interact with Twitter Search and trends data.

5. Amazon Product Advertising API: Amazon’s Product Advertising API gives developers access to Amazon’s product selection and discovery functionality to advertise Amazon products to monetize a website.