Although file extensions play an important role in signaling the purpose of a particular file to your computer, it is possible for different types of files to have the same extension. An example of this is the .js file extension, which is used by two files derived from different sources.
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A file with the .js file extension is known either as a Javascript file or a Jscript executable file.
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Both types of .js files contain a list of instructions that computers follow to complete tasks, however each file is written in its own programming language. The .js file extension serves as a marker to allow computers to recognize that the file holds these instructions.
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Javascript files are written in the Javascript programming language developed by Sun Microsystems. Jscript executable files are written in Jscript, which is a version of Javascript created by Microsoft.
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Both types of .js files are typically used to create features on Internet websites, such as opening drop-down boxes or launching pop-up adds.
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Because both types of these files are necessary for websites to function properly, never delete a .js file from your computer.
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