ICDL Base modules certify skills that are considered essential skills because they are crucial for anyone to possess who uses a computer.

Computer Essentials	Computer Essentials - skills and concepts relating to the use of devices, file creation and management, networks and data security.
Online Essentials	Online Essentials - skills and concepts relating to web browsing, effective information search, online communication and e-mail.
Word Processing	Word Processing - skills to accomplish everyday tasks associated with creating, formatting and finishing word processing documents, such as letters, CVs, and other documents.
Spreadsheets	preadsheets - skills to perform tasks associated with developing, formatting, modifying and using a spreadsheet, to use standard formulas and functions, and to competently create and format graphs or charts.