\'{a}The command \'{a} is used to place an acute accent over the letter 'a' inside text mode. This is often used in languages like Spanish to denote stress on a particular syllable.
The word 'niño' with an acute accent on the 'n'.
\text{El ni\'{n}o}The word 'canción' with an acute accent on the 'o'.
\text{canci\'{o}n}The name 'José' with an acute accent on the 'e'.
\text{Jos\'{e}}