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LaTeX is how serious academic writing gets done. A .tex file is plain text sprinkled with markup commands — `\section{}`, `\begin{equation}`, `\cite{}` — that a LaTeX compiler transforms into immaculately typeset PDF output. The learning curve is a cliff, but the results are unmatched: no word processor handles mathematical notation, cross-references, and bibliography management as gracefully.
The format has been the standard for scientific publishing since the 1980s. Physics, mathematics, computer science, and economics journals overwhelmingly accept (or require) LaTeX submissions. If you've read an academic paper with beautiful equations, it was almost certainly written in LaTeX.
You don't "open" a .tex file for viewing — you compile it. Install a TeX distribution (TeX Live, MiKTeX) and run `pdflatex` to produce a PDF. For a friendlier experience, Overleaf (free, browser-based) handles compilation, collaboration, and templates without local installation. VS Code with the LaTeX Workshop extension is the best desktop editor.