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It offers Unicode support and useful extras such as a spell checker, autocompletion, code-folding, and an integrated PDF viewer. It's an up-to-date, cross-platform-capable tool that integrates the features you need to prepare and create TeX documents in a single interface. LaTeX is the document markup language of TeX, and LaTeX editors are required to create TeX documents.
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TeX's mission has always been to make high-quality typesetting and publishing easy and consistent across platforms. Despite the explosion of online, e-book, and document publishing formats, TeX is still a cornerstone of academic, scientific, and technical publishing, as it has been since the late 1970s.
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