The statement of purpose is almost the same as a motivation letter. Both are often referred to as the same thing but there is a thin line of difference. The letter of motivation is written specifically to help the admission department understand your objectives and career goals related to the course and your future plans. It is generally short and factual. On the other hand, the SOP can include personal details about your past learning experiences, anecdotes, and how they connect with your current plans. It can be more detailed and longer than the letter of motivation.