An algorithm is a finite and unambiguous sequence of instructions and operations for solving a class of problems, An algorithm is a finite and unambiguous sequence of instructions and operations to solve a class of problems[1].

A database makes it possible to store and retrieve structured, semi-structured or raw data or information, often related to a theme or an activity; these can be of different natures and more or less related to each other, A database makes it possible to store and find structured, semi-structured data or raw data or information, often related to a theme or an activity ; these can be of different natures and more or less interconnected.

Office automation is a term that includes software that helps the company in writing documents. Microsoft Office is an office suite allowing, among other things, to write letters, write CVs (with Word), create presentations (with PowerPoint), create spreadsheets and graphs (with Excel).