The “DLL File is Missing” error indicates that a Dynamic Link Library (DLL) file required by a program is either missing, corrupted, or incompatible. Reinstalling the program that shows the error is a good first step, as it often replaces the missing DLL file. If the error persists, you can try manually downloading the DLL file from a trusted source and placing it in the appropriate directory. Exercise caution while downloading DLL files, as they can be a potential security risk if obtained from untrusted sources.