| Extension | DOCX |
| Full Name | Microsoft Word Document |
| Type | Document |
| Mime Type | application/vnd.openxmlformats-officedocument.wordprocessingml.document |
| Format | Binary |
The DOCX file format is the native file format used by Microsoft Word. It was created in the mid-2000s as a successor format to the older DOC file format. The switch from DOC to DOCX allowed for a fresh start, re-building the format from the ground up to be more flexible and easier to extend in the future.
A DOCX is actually a ZIP container file format, with the actual word document data stored within it in the form of many separate XML documents. This separation into individual XML documents means the relevant document components can be grouped together.
The use of the ZIP format as a container wrapper allows the DOCX files to remain small in size compared to the older DOC format. Along with Microsoft Word, there are many other Word processing applications that can open and work with documents in the DOCX format.
| Extension | HTML |
| Full Name | HyperText Markup Language |
| Type | Document |
| Mime Type | text/html |
| Format | Text |
HTML files are the native format for content that is displayed on websites. Hypertext Markup Language (HTML) was designed to allow formatted text content along with images to be displayed on a web page in an efficient and easy-to-use manner.
The ability to easily edit HTML files by hand is important, and most bespoke HTML web development is done manually. The content of an HTML file is stored within a highly structured layout consisting of "tags." For example, a general-purpose paragraph tag is represented by <p>, while an image will use <img>.
HTML files are at the core of what makes any website work, and support for editing them is included in all popular web development environments, such as Visual Studio Code and others.
