Question

what is a file extension? the last part of a file name that indicates its format (file type) a type of computer virus a password for a file the files download speed

Explanation:

A file extension is the last part of a file name after the dot (.). It indicates the format or type of the file, helping the operating - system and applications to know how to handle the file.

Answer:

The last part of a file name that indicates its format (file type)