grammar.articles.indefinite-forms
The indefinite article: un, una, unos, unas
Un libro, una casa; plural unos/unas means 'some' or 'a few': unos amigos, unas tres horas (approximation).
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Explanation
Un/una introduce something not yet identified: hay un mensaje para ti. Plurals unos/unas mean 'some' (unos documentos) and, before numbers, 'about': unas veinte personas.
Before feminine nouns with stressed initial a, un is usual: un águila, un alma — same sound rule as el agua.
Examples
Necesito una respuesta hoy.
I need an answer today.
I need an answer today.
Region: global
Llegaron unos treinta invitados.
About thirty guests arrived.
About thirty guests arrived.
Region: global