What is the primary function of a word processor?

A word processor's primary function is to edit text documents. This includes the ability to create, format, and manipulate written content, which is fundamental to producing documents such as letters, reports, essays, and other text-based materials. Word processors provide various tools that allow users to adjust font styles, sizes, and colors, as well as to include features like spell check, grammar suggestions, and page layout functions.

While creating financial models typically requires specialized software like spreadsheets, managing databases involves the use of database management systems. Designing presentations is the domain of presentation software, which is distinct from word processing tasks. Therefore, the correct answer highlights the core purpose of word processors in the realm of document preparation and text editing, distinguishing it from other types of software used for different applications.