well, its the stuff dat u really like 2 do and it entertains you, that what a hobby is and an interest is like something dat u want 2 learn more a bout.
well, if your a girl in primary school, then sticker collecting in something good and if your a boy, you can collect toy cars. if your a high schooler, try different sports! and if your a adult...
Reading. I try to read a book at least once a week. This shows your willingness of learning new things. ** If you DO NOT to read at all, this would not be a good answer as this backfire in the future.
Hobby is something people does for pleasure or because they feel like it. Interest are something people are interested in which is very similar to hobbies.