MathType works with Stack Exchange: Mathematics, allowing you to add equations to a question or answer response. Others can later open these equations in MathType to edit or to use elsewhere in Stack Exchange: Mathematics, or in other applications such as in Word or one of hundreds of other apps & sites that MathType works with.
Stack Exchange: Mathematics is a collaboratively edited question and answer site for people studying math at any level and professionals in related fields. Stack Exchange: Mathematics uses MathJax, a solution for displaying math on the web that works in all modern browsers. MathJax works behind the scenes on a website to display MathML and LaTeX equations.
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MathType is a powerful interactive equation
editor for Windows and Macintosh that lets you create mathematical notation
for word processing, web pages, desktop publishing, presentations,
elearning, and for TeX, LaTeX, and MathML documents. 