As the name suggests, SOP highlights your purpose; your purpose in applying to the particular university and the program; your general purpose in life.
The statement provides admission committees insight into your background, the kind of person you are, and your aspirations. A well-written SOP can overshadow your other weaknesses, making your case for acceptance even stronger.
As a first step, you want to understand the target audience; consider what kind of applicants the admission committee would consider. Accordingly, draft your statement of purpose, which also highlights your skills like leadership and communication.
(Note: If you’re applying to more than one college, you should ideally create an individual SOP for each. Also, there are many service providers who can write your SOP; don’t opt for them. Remember, you know yourself better than others. So, it’s best if you write the SOP yourself.)