A "caller" is a person who makes a phone call to another individual or organization. This term is commonly used in telecommunications to refer to someone initiating a conversation over the phone. Callers can use various devices, such as landlines or mobile phones, to connect with others. In a broader context, the term "caller" can also refer to someone who visits a place, such as a business or a home, to communicate or deliver a message. In customer service, for example, a caller may reach out to a company to ask questions or resolve issues related to their products or services.