The Spanning Tree Protocol (STP) is a network protocol that is situated in Layer 2 (Data Link Layer) of the Open Systems Interconnection (OSI) model. It was built to prevent the problems that arise when data is exchanged through computers over a Local Area Network (LAN). If 2-3 switches are connected together, they broadcast by default. When a message is broadcasted, it is sent all across the switches back and forth. This could lead to a broadcast storm or the formation of a loop. Readmore: https://www.nwkings.com/what-is-spanning-tree-protocol