Merging two sorted linked lists is a fundamental problem that tests your ability to manipulate linked list structures. The goal is to combine two pre-sorted linked lists into one sorted list. In TypeScript, you can approach this by iterating through both lists, comparing the current node values, and adding the smaller value to the new merged list. You continue this process until you reach the end of both lists. If one list finishes before the other, you append the remaining nodes from the unfinished list. This process has a time complexity of O(n + m), where n and m are the lengths of the two lists. Merging sorted linked lists is often used in divide-and-conquer algorithms like merge sort, and mastering it is crucial for solving problems involving linked list manipulation and efficient sorting techniques.