Todo is a common adjective and pronoun that typically means "all" or "every." Like most other adjectives, todo must match the noun it refers to in number and gender; when used as a pronoun, it also changes with number and gender according to the noun it replaces.

As an adjective, todo can come either directly before the noun or frequently before the definite article that comes before a noun. In this usage, todo is typically the equivalent of the English "all":

• Vamos a tomar todas las medidas apropiadas para eliminar la discriminación. We are gong to take all appropriate means to eliminate discrimination.
• Tenemos zapatos de todos tipos y colores. We have shoes of all types and colors.
• Todo el tiempo estoy pensando en ti. I am thinking about you all the time.
• Todas las personas son iguales, pero unas son más iguales que otras. All persons are equal, but some are more equal than others.
• Hawái es el estado con mayor porcentaje de gente asiática de todo Estados Unidos. Hawaii is the state with the highest percentage of Asian people in all of the United States.
• El papa ha afirmado que toda persona tiene derecho a emigrar. The pope has stated that each person has the right to emigrate.

As a pronoun, todo and its variations typically have the meaning of "all," although the context can require other translations:

• Todo es posible. Everything is possible.
• Todos fueron a la playa. They all went to the beach. (Or, everyone went to the beach.)
• Todas estamos bajo mucha presión. All of us are under a lot of pressure.

• Todo puede cambiar de un segundo. Everything can change in a second.
• Todo está bien. All is well.
• No todos quieren hacer negocio en Internet. Not everyone wants to do business on the Internet.
• A pesar de todo tenemos algo que festejar. Despite everything, we have something to celebrate.

Sometimes, todo can be used to add emphasis:

• El corazón latía a toda velocidad cuando te vi. My heart was beating at a high speed when I saw you.
• Te lo mostramos con todo detalle. We're showing it to you in great detail.
• Visitar Manzanillo es toda una aventura. Visiting Manzanillo is quite an adventure.

Todo and its variations are used in various phrases and idioms:

• ante todo — primarily, principally, above everything
• así y todo — nevertheless, in spite of everything
• con todo — nevertheless, in spite of everything
• del todo — entirely, without exception
• de todas todas — with absolute certainty
• de todo en todo — absolutely
• en todo y por todo — under all circumstances
• por todo, por todas — in total
• sobre todo — primarily, principally, above everything
• todo el mundo — everyone

Using todo with a plural form of ser: It is common in Spanish for a sentence of the form "todo + conjugated ser + plural predicate" to use a plural form of ser. The phenomenon, which contrasts with English usage, can be seen in these examples:

• Todo son buenas noticias. It's all good news.
• No todo son millonarios en el béisbol profesional. Not everyone is a millionaire in professional baseball.
• Todo son problemas. Everything is a problem.
• Todo eran mentiras. They were all lies.