This is the 10590th most frequent Russian word.
внешняя
External; outer.
Here, 'внешняя' is used as an adjective meaning 'external' or 'outer', modifying the noun 'сторона'.
Внешняя сторона здания была украшена гирляндами.
The exterior side of the building was decorated with garlands.
In this sentence, 'внешняя' refers to 'external' or 'visible', describing the noun 'красота' (beauty).
Её внешняя красота привлекала внимание всех окружающих.
Her outer beauty attracted the attention of everyone around.
Here, 'внешняя' signifies 'foreign' or 'external', characterizing the noun 'политика' (policy).