A Proof Assistant is a software tool designed to help users construct and verify mathematical proofs. It provides a framework where users can write formal statements and then use logical rules to derive conclusions. This ensures that the proofs are correct and free from errors, making it easier to work with complex mathematical concepts. These tools are often used in fields like computer science and mathematics, where rigorous proof is essential. Popular examples of proof assistants include Coq, Lean, and Isabelle. They enable researchers and students to explore formal verification, which is crucial for ensuring the reliability of algorithms and systems.