What are the differences between using a push-in connector and a wire nut for connecting electrical wires?

A push-in connector is a type of electrical connector that allows wires to be inserted and secured by pushing them into the connector. A wire nut, on the other hand, is a twist-on connector that requires twisting the wires together and then securing them with the nut. The main difference is in the method of connection: push-in connectors are quicker and easier to use, while wire nuts provide a more secure and reliable connection.