A consequence refers to an event that occurs after a behavior and can either strengthen or weaken that behavior. It is the outcome or result of an action.
Reinforcement refers to any event or stimulus that increases the likelihood of a behavior occurring again. For example, giving praise for completing homework can act as reinforcement.
Punishment refers to any event or stimulus that decreases the likelihood of a behavior occurring again. For instance, taking away privileges for breaking curfew can serve as punishment.