A more thorough explanation:

Definition: Joinder is the legal process of combining the claims of two or more parties into a single lawsuit. It allows multiple parties to join together and pursue their claims in a more efficient and cost-effective manner.

Example: Suppose that two individuals, John and Jane, were involved in a car accident with a third party, Tom. John and Jane both suffered injuries and want to sue Tom for damages. Instead of filing separate lawsuits, they can join their claims together in a single lawsuit. This is known as joinder.

Explanation: In this example, John and Jane have similar claims against Tom arising from the same incident. By joining their claims together, they can save time and money by avoiding duplicative discovery and court proceedings. Joinder also promotes judicial efficiency by reducing the number of lawsuits that need to be filed and heard by the court.