Asterisk is an open-source telephony platform that is classified into two types of variables: Dialplan Variables and Global Variables. These variables are used to store and manipulate data within the Asterisk dialplan and can be accessed and modified during the call processing. For more explanation on this video: https://www.linuxhelp.com/how-to-use-variables-and-global-variables-on-asterisk-dialplan-context-on-oracle-linux-9-3