Where do you get pictures to add to your discussion or post?

I have a file in my desktop and when I surf at net any photo I find I save it there.many times I search for photos that I can see in my interest area here,but don't forget except the times you search about photos many times when you serf for other reasons you can find at any site good photos.If it isn't copyrighted you can safe and use it. I so many people they upload the m personal photos ,I don't use to do but if you want you can do it.