Captions are classified into four types: standard, group, identification, and quotation only. The tiny stories we covered previously are the regular (or enlarged) captions. These subtitles are normally three sentences long, however two sentences can suffice if space is restricted. For example, if there is not enough room for three sentences, then two sentences could be used instead. The next type of caption is called a group caption. These are used when there are several images that all relate to each other in some way. For example, if a photo album were put on display at an art gallery, it would have a group caption because everything in the picture is from the same event/trip/etc. Group captions are also useful if you want to call attention to certain words or phrases written on multiple photos. For example, if a photo was taken at a party where someone had written "Happy 20th!" on it, a group caption would mention this fact while still giving more information about the photo itself. Identification captions are very similar to group captions, except they refer to one specific image. For example, if a museum displayed a painting with a description written on it explaining the significance of the piece, this would be an identification caption since the photo alone is what's being described. Quotation captions are used when a phrase or word from another source is attached to the image file name itself.