Phone systems are communication networks that allow people to make and receive calls. They can be traditional landline systems, which use physical wires, or modern VoIP (Voice over Internet Protocol) systems, which transmit calls over the internet. Phone systems can also include features like voicemail, call forwarding, and conference calling to enhance communication. Businesses often use PBX (Private Branch Exchange) systems to manage multiple phone lines efficiently. These systems can connect internal calls and route external calls to the appropriate department. With advancements in technology, many phone systems now integrate with CRM (Customer Relationship Management) software to improve customer interactions.