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Mi abuelo es muy activo para su edad.
My grandfather is very active for his age.
Engaged in physical or mental work; energetic
Ella lleva una vida activa y saludable.
She leads an active and healthy life.
Commonly used to describe people, lifestyles, or systems.
In operation or use; functioning
El sistema está activo las 24 horas.
The system is active 24/7.
Often used in computing, engineering, or finance.
In finance: assets that can generate income
Los activos de la empresa incluyen propiedades y acciones.
The company's assets include properties and stocks.
Contrast with 'pasivo' (liabilities).
Remember that 'activo' changes to 'activa' for feminine nouns (e.g., 'una mujer activa').
From Latin 'activus', derived from 'actus' (act, deed), from 'agere' (to do).
As an adjective, 'activo' agrees in gender and number (activo/activa/activos/activas). In finance, it refers to resources with economic value.