GSM and CDMA are two types of what?

GSM and CDMA are two types of cellular networks, which are essential technologies for mobile communication. GSM, or Global System for Mobile Communications, is a standard developed to describe protocols for second-generation (2G) digital cellular networks used by mobile phones. It allows for the exchange of voice and data over mobile networks, employing a time division multiple access (TDMA) technique for allowing multiple users to share the same frequency channel.

On the other hand, CDMA, or Code Division Multiple Access, is a more recent technology that allows multiple signals to occupy a single transmission channel, using unique codes for each communication. It is known for its efficiency and ability to cover a wide area, providing better call quality and data services.

Both GSM and CDMA are foundational to the larger ecosystem of mobile communications, setting the stage for advancements in mobile technology and services. Their classification as cellular networks is key to understanding the different types of technologies used in mobile communication systems. This contrasts with the other options, which pertain to distinct types of network communications that do not directly involve the principles of mobile cellular technology.