TeXForm[expr] prints as a TeX version of expr.
TeXForm produces plain TeX. Its output should be suitable for both LaTeX and AMSTeX.
TeXForm acts as a "wrapper", which affects printing, but not evaluation.
TeXForm translates standard mathematical functions and operations.
Symbols with names like alpha and ALPHA that correspond to TeX symbols are translated into their corresponding TeX symbols.
Following standard mathematical conventions, single-character symbol names are given in italic font, while multiple character names are given in roman font.
All standard Mathematica box structures are translated by TeXForm.
Mathematica special characters are translated whenever possible to their TeX equivalents.
See The Mathematica Book: Section 1.11.6 and Section 2.8.1.
See also: TeXSave, StandardForm, TraditionalForm, MathMLForm.