API is very imprtant concept in IOT.API based python programming.

API is very important in IOT.API required in programming

1. API

2. API An Application Programming Interface (API) contains software building tools, subroutine definitions as well as communication protocols that facilitate interaction between systems. An API may be for a database system, operating system, computer hardware or a web-based system

3. Cont.. An Application Programming Interface makes it simpler to use certain technologies to build applications for the programmers. API can include specifications for data structures, variables, routines, object classes, remote calls etc.

4. API connection

5. Uses of Application Programming Interfaces Operating Systems The interface between an operating system and an application is specified with an API. For example- Posix has API’s that can convert an application written for one POSIX Operating System to one that can be used on another POSIX operating system.

6. Libraries and Frameworks Often API’s are related to software libraries. The API describes the behaviour of the system while the libraries actually implement that behaviour.  A single API can have multiple libraries as it can have many different implementations A framework is based on many libraries that implement different API’s whose behaviour is built into the framework.

7. Web APIs The application programming interfaces for web servers or web browsers are known as web API’s. These web API’s can be server side or client side.

8. Server side web APIs have an interface that contains endpoints which lead to request-response message systems that are written in JSON or XML. Most of this is achieved using a HTTP web server. Client side web API’s are used to extend the functionality of a web browser. Earlier they were in the form of plug-in browser extensions but now JavaScript bindings are used.

9. Remote APIs The remote application programming interfaces allow the programmers to manipulate remote resources. Most remote API’s are required to maintain object abstraction in object oriented programming. This can be done by executing a method call locally which then invokes the corresponding method call on a remote object and gets the result locally as a return value.