Here I am giving you information about Difference Between Summer training and Summer Internship below :

Internship is part and parcel of the selected degree. 'Internship' is an opportunity where you practically apply your academic knowledge , example-doing some project work, etc. Generally it will be in the last semester.

On the other side summer internship can be attended by the in service candidates.. it is a training program in that you undergo training in some field in a company/ industry and you gain more practical knowledge, sharpen you skills etc.