What is the difference between dip powder and SNS?

Could you please clarify the difference between dip powder and SNS for me? I've heard of both but am not entirely sure how they differ. Is one more durable than the other? Are there any advantages or disadvantages to each method? Also, do they require similar maintenance routines or are there any specific steps I should be aware of when caring for nails done with either dip powder or SNS? I'd appreciate any insight you could provide.