Food and Drink:
* Taco
* Burrito
* Salsa
* Fajita
* Guacamole
* Quesadilla
* Mojito
* Siesta (though it's more of a concept than a word)
General:
* Amigo (friend)
* Hasta la vista (goodbye)
* Olé (used to express excitement, especially during bullfights)
* Fiesta (party)
* Mañana (tomorrow)
* Adios (goodbye)
* Ciao (goodbye)
Expressions:
* No problemo (no problem)
* Hasta luego (see you later)
* ¡Hola! (hello)
* Ay, caramba! (used to express surprise or frustration)
* Más (more)
* Por favor (please)
* Gracias (thank you)
Words that have become part of the English language:
* Alligator
* Cigarette
* Tornado
* Mosquito
* Siesta
* Barbecue
These are just a few examples, and there are many more Spanish words that have become part of English. The use of Spanish words in English reflects the cultural and linguistic influences between the two languages.