TMP is the file extension that is used for temporary files which are found on personal computers. Temporary files are usually wither backup files or cache files.Cached temporary files are created by programs when there is a need for extra memory space. Backup temporary files are also created by programs to temporarily store data.
Usually TMP files are deleted by the programs that have created them, sometimes this doesn't happen and to remove these files you will need to use the Disk Clean up feature that is part of the Windows operating system or programs such as C Cleaner which remove unneeded programs and files.
In some cases the temporary files are needed at a later time and care should be taken when deleting them.
» Various Programs
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Software to open .tmp files
What are .tmp files