$\LaTeX$ introduction
$\LaTeX$ is a typesetting system, that can be used to create professional looking documents. For example cover letters for employment, student applications, etc.
Its main use, however, is within academia. $\LaTeX$ excels at producing excellent looking reports, scientific papers, articles and has strong maths and science notation functionality.
for example:-
$CH_4$ for chemistry and $\frac{df}{dx}$ for maths as well as greek characters for example:- $$\pi , \Sigma , \Omega , \alpha$$
Which is ideal for Physics and Astronomy.