A good reason for taking notes in your own words, rather than verbatim, is that

A) most lecturers ramble and are difficult to follow.
B) most lecturers use words you will not understand.
C) this reduces the likelihood that you will later engage in plagiarism.
D) this forces you to organize the information in a way that makes sense to you.

Taking Notes

The practice of recording information from various sources, efficiently aiding in the retention and understanding of knowledge.

Verbatim

In the exact same words as were originally used; word-for-word replication or quotation.

Own Words

In an individual's unique manner of expression, typically denoting conveying something in one’s personal language or style.