What are the contents of a good SoP (Statement of Purpose)?

A good or perfect Statement of Purpose should incorporate the following components (http://www.sopwriting.net/our-services/):
i. Background of the applicant: This entails the general information about you. It commonly involve details of your identity.
ii. Education and professional experience: This component allows you to prove to the admission committee your previous academic achievements, prior to the one you are applying for.
iii. Both long-term and immediate goals in an individual’s life: This is the part where you market yourself using what inspires you most in life. Talk about your dream, vision, mission, and or ambitions.
iv. Great interest in the chosen field of study. You must prove that you are deeply interested in joining that particular university/institution.
v. Reasons for your decisions to pursue education at the specified institution/university.
It is what makes you so special and unique in your application