A statement of purpose (SOP) is a written statement that describes your identity and your work. It is a reflection of your character and your extracurricular accomplishments. SOP writing thus displays aspects of your personality other than your academic credentials. A well-written SOP demonstrates that you are an ideal fit for the university to which you are applying.
A strong SOP may increase your chances of getting an acceptance letter. This document should include details about the events that led you to choose this professional path.
You should also state your ambitions for advancement in the institute or university to which you apply. After reviewing your SOP, the admissions committee should be able to determine how much value you would provide to the course to which you are accepted.