High School education is not compulsory in Japan and students normally have to take an entrance exam to enter the school of their choice. High school in Japan, like Junior High, is three years years long.
High Schools have school uniforms, although typically there is no school lunch - instead students bring their own lunch box (bento) or buy their lunch at the school cafeteria.
High Schools sometimes specialise and it is not unusual for schools to be famous for specific subjects. For example, a high school maybe considered the top school in the prefecture or one of the top schools for English or Science etc. in the prefecture. There are also schools that are aimed at more technical fields like agriculture and fishing.