Selenium:Intro

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Selenium is a set of different software tools each with a different approach to supporting test automation. 
Most Selenium QA Engineers focus on the one or two tools that most meet the needs of their project,
however learning all the tools will give you many different options for approaching different test automation problems. 
The entire suite of tools results in a rich set of testing functions specifically geared to the needs of testing of web 
applications of all types. These operations are highly flexible, allowing many options for locating UI elements and comparing 
expected test results against actual application behavior. One of Selenium’s key features is the support for executing one’s tests
on multiple browser platforms.

It is not always advantageous to automate test cases. There are times when manual testing may be more appropriate. 
For instance, if the application’s user interface will change considerably in the near future, then any automation might need 
to be rewritten anyway. Also, sometimes there simply is not enough time to build test automation. 
For the short term, manual testing may be more effective. If an application has a very tight deadline,there is currently no 
test automation available, and it’s imperative that the testing get done within that time frame, then manual testing is the best 
solution.