My Gallery of photos is "missing" or has deleted. How can I try to recover my photos?

[AC Question]

I still have my snapchat, insta gram and screen shots, but not my gallery from my camera.

 

[B. Diddy]

Welcome to Android Central! Which phone? Are you saying the Gallery app itself is missing, or that within the Gallery app, you can no longer see your Camera folder? Have you used a file manager app to look at your /DCIM/Camera directory to see if the actual files are still there?