The first thing LaTeX does when processing ordinary text is to translate your input file into a string of glyphs and spaces. To produce a printed document, this string must be broken into lines, and these lines must be broken into pages. In some environments, you do the line breaking yourself with the \\ command, but LaTeX usually does it for you.
Prvni vec, kterou LaTeX udela, kdyz zpracovava nejaky text je prevedeni vstupniho souboru na posloupnost ____ a mezer. Pro vytvoreni tisteneho dokumentu tato posloupnost musi byt nalamana na radky a tyto radky pak musi byt rozdeleny na stranky. V nekterych prostredich musite radkove zlomy udelat sami prikazem \\ , ale vetsinou toto lamani textu obstarava LaTeX sam.