There is no official definition of managed and unmanaged switches. Different vendors may market their switches differently. However, in general an unmanaged switch does not support or has very limited configuration options and is meant to work for most networks right out of the box. Managed switches require more configuration to properly function but offer more features and functionality.
A network switch (also called switching hub, bridging hub, officially MAC bridge) is networking hardware that connects devices on a computer network by using packet switching to receive and forward data to the destination device A network switch is a multiport network bridge that uses MAC addresses to forward data at the data link layer (layer 2) of the OSI model Some switches can also forward data at the network layer (layer 3) by additionally incorporating routing functionality Such switches are commonly known as layer-3 switches or multilayer switchesSwitches for Ethernet are the most common form of network switch