Knock is a real estate platform that offers a unique home trade-in program, allowing homeowners to buy a new home before selling their existing one. The platform uses AI-driven tools to provide accurate home valuations and streamline the buying and selling process. Knock's trade-in program eliminates the need for temporary housing and reduces the stress of coordinating two transactions simultaneously. The platform also offers a mortgage solution, making it easier for users to finance their new home while selling their old one. Knock's focus on convenience and efficiency makes it a valuable tool for homeowners looking to move quickly and seamlessly.