Synchronicity is used to bind the client to the execution of the service. In synchronous invocations, the client blocks and waits for the service to complete its operation before continuing. On the other hand, synchronous operations facilitate a client to invoke a service and then execute different functions.

In the context of web services, synchronicity refers to the timing and coordination of actions between different components or systems. It indicates whether communication between these components happens in a synchronous or asynchronous manner.

Synchronous communication means that the sender and receiver are both active and available at the same time. In contrast, asynchronous communication allows the sender to continue its work without waiting for an immediate response from the receiver.

So, the correct answer would depend on the specific context of the question and the nature of the web service being discussed.