This video is about basic segment trees without lazy propagation. Segment trees without lazy propogation support the same types of queries and updates as a fenwick tree, but you can use them for more things. For example, a fenwick tree can be used for min, max, sum, gcd, xor, and more.
Fenwick Tree video: https://www.youtube.com/watch?v=QH1jn1u8P78
