What does the term 'spectrum' refer to in radio communications?

The term 'spectrum' in radio communications refers specifically to the range of radio frequencies that are utilized for transmitting and receiving information. This encompasses a vast array of frequencies allocated for various types of communication, including but not limited to AM and FM radio, television broadcasts, cellular communications, and Wi-Fi. The radio frequency spectrum is a crucial concept because it determines how different communication technologies can coexist without interference, as well as how bandwidth is allocated to different services and applications. Understanding the spectrum is essential for effective communication and helps in managing the electromagnetic spectrum to ensure fair access for all users.