> I own a Canon EOS 1100D camera that was released in 2011. What lenses are still compatible with this model?

Canon EF lenses: All of them. Every single one made since 1987 when the EF mount was introduced.    

Canon EF-S lenses: All of them. Every single one made since 2004 when EF-S lenses were introduced along with the EOS 20D.

Other lenses made by third party manufacturers for the EF/EF-S mount: Most of them made *since* the older camera in question appeared on the market. [There are sometimes compatibility problems][1] with *older* third party lenses and *newer* EOS (or Nikon, or Sony, or Pentax, Panasonic, Olympus, etc.) cameras. You would need to research a particular lens to see if any compatibility issues have been reported with your camera. Most are fairly well documented and easy to find with a proper internet search. In general you shouldn't have to worry about any third party EF lenses released since around 2011 when your EOS Rebel T3/1100D was introduced.


  [1]: https://photo.stackexchange.com/q/83122/15871