Tyl system module handles tasks in a specific subject.
Tyl system module features:
Say we want to read the contents of a file. We can use the io system module, with the read function, usually referred to as io.read function.

Here's io.read function:
io.read path
io module is responsible for file system actions. read is a function in io module that is used for reading files. So, io.read function gets the path, reads the file at path if exists, and returns the contents of the file.

All system modules are in System Modules Reference

Tyl 2.2 introduces dynamic system modules that work in some ways as classes in other programming languages. These modules handle tasks such as database management, running processes and network TCP/IP communication.

A thorough guide on how to work with dynamic system modules is found in Dynamic System Modules page