What is Automation Testing?

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it is another way of software testing which provides automated software tools to execute test cases based on the test script.
The test script will be written in the programming language according to automation software tools.
Manual testing is better for the waterfall model but it will take more time to implement testing operations in the agile model because the agile model will use regression testing (continuous testing of the application from end to end ) which is not possible by manual testing.
Name of automation tools:-
1 QTP (Quality Test pro):-                                    VB Script
2 Selenium Web Driver:-                                      C#, JAVA, Ruby, Python
3 Selenium TestNG:-                                             C#, JAVA, Ruby, Python
4 IBM Rational:-                                                   JAVA
5 APPIUM (Mobile Automation Testing):-        JAVA, C#, Python
6 CUCUMBER:-  API Testing JAVA, C#, PYTHON
7 Selenium IDE:-  JAVASCRIPT
8 JUnit (Unit Testing):- JAVA, Karma, Jasmine

9 Selenium Framework:-  JAVA, MAVEN, Python, Apache POI

Advantage Automation Testing:-
1 it provides accurate result in complex application
2 Consume Less Resource and reduce testing time of application
3 test script reusability
4 test report easy to understandable by developer
5  we can easily perform load testing, volume testing and stress testing using automation tools.
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The disadvantage of automation testing:-
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1   it does not provide test analyses, planning, and test report only implement test scripts and test execution.
2 it is mostly used to implement functionality testing of a software system.
3 automation testing is not better for the waterfall and spiral model. it is only preferred for the agile model
4 it takes more time for system testing and integration testing, it is best for component testing.
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What is selenium:-
it is open source automation software tools that provide a complete framework to create a test script.
selenium is light-weight and operating system independent tools that can be easily installed under Eclipse IDE tools.
Selenium is a free and open-source product for testing purpose hence mostly IT company prefers selenium tools.
Component of Selenium:-
1 Selenium IDE
2 Web Driver
3 TestNG
4 Selenium Framework

5 Selenium GRID.

6 Selenium RC

Some advanced tools for Automation Testing:-

1) Appium 

if you want more information then click on the video link also