General meaning:
* To lend: This is the most common meaning. Example: "Puedo prestarte mi libro." (I can lend you my book.)
Specific meanings:
* To pay attention: "Presta atención a la clase." (Pay attention in class.)
* To provide: "El banco presta un servicio de cambio de divisas." (The bank provides a currency exchange service.)
* To give (emphasis): "Presta importancia a los detalles." (Give importance to the details.)
* To give (in terms of service or performance): "El cantante prestó un gran concierto." (The singer gave a great concert.)
The exact translation of prestar will depend on the context of the sentence.