All the other documents are like a testimony of your credentials and achievements but the SOP is your story that reveals your personality in your own words. Hence it has to be unique and should talk about the ideas that motivate you, your journey, challenges faced, lessons learnt and most importantly the reason for your pursuit of the said academic course and the roadmap in future. It is also an excellent opportunity for you to justify your weaknesses or gaps in your academic career with the right reasons while highlighting your strengths. All this should be done clearly and concisely within the given word limit so that your SOP convinces the admission officers about how driven you are to pursue this course and how you are a prospective student who would achieve the learning objectives and add value to the class.