LaTeX is a markup language and typesetting system commonly used in mathematical and scientific writing. It can be used to create documents from scratch or display equations in a web browser with the help of plugins, as is the case in Pressbooks.
Below is an example of what LaTeX can look like. This is a simple example, but LaTeX can be used to write much more complex expressions.
Use the formula [latex]V=\pi r^2h[/latex] to calculate the volume of a cylinder.