Videoconferencing allows people from different places to hold meetings through audio and video transmissions, bringing them closer together. It can be either simple, involving two individuals, or complex with multiple sites and participants. The key components of videoconferencing are cameras, microphones, speakers and monitors. There are different types including personal, business, and web videoconferencing. Some etiquettes for videoconferencing include sending a message before a video call to check availability, and being aware of one's surroundings during the call. Skype is an application that provides free calls between computers through internet, and some etiquettes for Skype calls include messaging before a video call and ensuring one's background is tidy.