What's same about a pinhole camera and a SLR camera is that they both take photo's.
-On the pinhole camera though you have to open a flap to take the picture and hold it for 20 sec. and it'll take the photo by itself if you have photo paper. You also have to manually develop your film when your done using chemicals in a dark room.
-On the SLR camera you can adjust the light, and zoom of what your taking a picture of you only have to press a button and it takes your photo. You can take the film to a store to get it developed.