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"In Microsoft Word, templates are pre-designed documents that you or someone else (such as Microsoft) creates to use as a pattern for a project. The template could be for a business card, brochure, resume, presentation...the list goes on. Regardless of the purpose, templates provide the design consistency that any organization (or individual) needs to look professional. (You can also find templates for Excel, PowerPoint, and other applications, but in this article we’re focusing on Microsoft Word.)
The template contains a specific layout, style, design and, sometimes, fields and text that are common to every use of that template. Some templates are so complete (such as business cards), you only have to change the individual’s name, phone number, and email address. Others, such as business reports or brochures, could require that everything is changed except the layout and design.
Once you create a template, you can use it over and over. Remember that while you open a template to start a project, you save the project as another file type, such as the basic .docx Word format, for editing, sharing, printing, and more. The template file stays the same, unless or until you want to change it (more on that later)."
Read more about templates at PC World.