Red-black trees are self-balancing binary search trees where each node is colored red or black. They ensure that the tree is balanced during insertions and deletions by following rules about coloring nodes and their children. Binomial heaps are a data structure similar to binary heaps but support efficient merging of heaps. They are implemented as a collection of binomial trees ordered by size. Common operations like insertion, deletion, and merging take O(log n) time on average in both red-black trees and binomial heaps.