Summer classes are an option for students at some colleges and they can really help when it comes to graduating early or just managing an easier workload for fall and spring semesters. In high school, you might have looked at summer school as a punishment or for students who were behind. In college, it can really set you up for success and put you forward your peers. Students have these options to make things easier for them if they have heavy credit-filled semesters. It can also provide an opportunity to stay on campus year-round and continue that college life without any interruptions.
This can be a good option for students that don't want to travel home for the summer. It also lets you stay in that school mindset so you don't have to readjust after the long summer break. These classes also tend to be smaller due to the obvious fewer students taking classes during summer time. This can allow you to get more in-depth learning and more one-on-one time with your professors. Also when you go back in the fall you may have one less class to have to take so you can gain more free time during the heavy part of the school year.
Summer courses however tend to be accelerated most times. With fewer weeks there are more classes every day and for longer periods. This can be easier or harder than the regularly scheduled courses depending on the way you like to learn. A lot of people choose to do these courses for their languages so they can focus their attention on a lot of information during a short time period.
Summer courses can really be a benefit for you if it fits your situation.