The term "ignition key" refers to a device used to start a vehicle's engine or turn on its electrical system. There are several synonyms used for the same purpose, including car key, starter key, and ignition switch. Other similar terms include key fob, transponder key, and remote keyless entry. Some older vehicles may use a traditional key, while newer cars often use electronic keys or push-button start systems. No matter what it's called, the ignition key or its equivalent is an essential component of any vehicle, allowing drivers to start and operate their cars safely and efficiently.