What are examples of background of a study?
examining and presenting existing literature on your subject, so that you provide a solid basis on which your own study is built. hopefully you are not merely repeating what has already been done, but rather taking it further or expanding on it in some way.
Examples of background of study are the key subjects one gets to read in a particular course. These are the topics that are in line with what you are studying. For example if you are taking accounts, you will have to do maths and English.