Final answer:
Deadlocks occur when there are conflicting needs for resources by two or more processes, causing them to be unable to proceed. For example, if two processes both need the same resource and cannot continue until it is released, a deadlock occurs.
Step-by-step explanation:
Deadlocks occur when two or more processes are unable to proceed because each is waiting for a resource held by another process. In this case, deadlocks occur when there are conflicting needs for resources. When multiple processes request the same resource and cannot continue until it is released by another process, a deadlock happens.
For example, imagine two processes, A and B, both needing the same printer to complete their tasks. If process A acquires the printer and doesn't release it, process B will be waiting indefinitely for the printer, resulting in a deadlock.