Trial and Error Theory of Learning describes how learning occurs through a process of trial and error. Edward Thorndike conducted experiments where hungry animals like cats, rats, and chickens were confined in puzzle boxes and had to perform random actions to escape and access food. Over successive trials of escaping the box, the animals made fewer errors and learned to directly connect the specific action of pulling a string or lever to escaping the box and receiving food. Thorndike concluded that learning happens gradually through a process of trials, errors, and strengthening the connection between a situation and correct response.