Alternation is a term used to describe the process of switching or exchanging one thing for another. It is also known as INTERCHANGE, which is an 11-letter word, and SWITCH, which is a 6-letter word. Alternation is a common practice in many areas, such as economics, politics, and even everyday life. For example, in economics, it is often used to refer to the process of trading goods and services between two parties. In politics, it is used to refer to the process of changing power from one party to another. In everyday life, it is used to refer to the process of exchanging one item for another, such as trading a book for a movie ticket.