What Are Macros in Gaming?
The concept of macros can be lengthy and complex but for a simple and quick answer, as detailed by this video made by Linus, a macro is a shortcut that allows you to bypass the actions needed for a multiple-step process with a single keystroke.
These shortcuts are useful because they can greatly speed up the execution of boring and repetitive tasks.
The macro can usually be saved by software like Razer Synapse or in case your peripherals (mouse or keyboard) support that function, the macro can be stored in the on-board memory of your device.