One-to-many information delivery scheme. It is a one-way communications method.
In the context of traditional content delivery such as by over-the-air (OTA) signals such as radio or television, broadcasts emanate from central delivery locations to receivers which “tune” to the relevant channel (e.g. wavelength of electro-magnetic signal).
In the context of computer networks, broadcasts are infrequently used to flood information in a local context usually as part of some bootstrapping function.