Summary

Summaeies are use when people use to get infomation about what you've learned.

There are two types of summaeies that you can use and one of them is repeat and the other one is evaluate. 

The repeat is copying the mechanisms that you've have written. The evaluate one is your opinion or gessing the mechanisms.

A summaeies is a usefull thing in the explanation because if you use the summarys it tell the people infomation.