An oral agreement is usually binding but not always. Florida has a statute of frauds so certain types of contracts are not binding unless they’re in writing and signed by the party against whom it’s charged. For example, selling a house or a piece of real property requires a written agreement. It has to be signed by the other party. Commercial leases exceeding a year’s length will need to be in writing. There’s a witness requirement of 2 witnesses to the execution of the lease. Many other contracts can be enforced simply because they’re oral contracts where one part has agreed and as somebody has often said, its simply a handshake where they’ve mutually agreed orally as to what the contract is.