Compatibility testing means checking how the software interacts and shares information with other software.The interaction can be between two programs on same computer , or different computers or on internet.
It can be of two types :
1.Forward Compatibility.
2.Backward Compatibility.
1.Forward Compatibility: If something is forward compatible then it will work with future versions of the software.
2.Backward Compatibility: If something is backward compatible that means it will work with previous versions or releases.
eg. A .txt file created in Notepad 2000 is said to be forward compatible if it works with future versions of windows such as windows 2003 etc.It is said to be backward compatible if it works with previous versions of windows such as windows 98.
It is very important to perform compatibility testing as different users have different versions of software.If the software is compatible it increases the usability of the software.
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