The word for ‘tall’ in Spanish is ‘alto’.
In Spanish, adjectives must agree in gender and number with the nouns they describe. Therefore, if you are referring to a tall man, you would say ‘él es alto’, meaning ‘he is tall’. For a tall woman, you would use ‘ella es alta’‘ellos son altos’ for a group of men, or ‘ellas son altas’ for a group of women.
Remember that context is crucial when using adjectives in a sentence. The flexibility of the Spanish language allows for subtle nuances that can help convey exactly who or what you are describing.