A taco ( /ˈtɑːkoʊ/) is a traditional Mexican dish composed of a corn or wheat tortilla folded or rolled around a filling. A taco can be made with a variety of fillings, including beef, chicken, seafood, vegetables and cheese, allowing for great versatility and variety. A taco is generally eaten without utensils and is often accompanied by garnishes such as salsa, avocado or guacamole, cilantro, tomatoes, minced meat, onions and lettuce.

According to the Real Academia Española, publisher of Diccionario de la Lengua Española, the word taco describes a typical Mexican dish of a maize tortilla folded around food ("Tortilla de maíz enrollada con algún alimento dentro, típica de México"). The original sense of the word is of a "plug" or "wad" used to fill a hole ("Pedazo de madera, metal u otra materia, corto y grueso, que se encaja en algún hueco"). The Online Etymological Dictionary defines taco as a "tortilla filled with spiced meat" and describes its etymology as derived from Mexican Spanish, "light lunch," literally, "plug, wadding." The sense development from "plug" may have taken place among Mexican silver miners, who used explosive charges in plug form consisting of a paper wrapper and gunpowder filling.

Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future. Time is a component quantity of many measurements used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change of quantities in material reality or in the conscious experience. The temporal position of events with respect to the transitory present is continually changing; events happen, then are located further and further in the past. Time has been a major subject of religion, philosophy, and science, but defining it in a manner applicable to all fields of study without circularity has consistently eluded scholars. A simple definition states that "time is what clocks measure".

Time is one of the seven fundamental physical quantities in the International System of Units. Time is used to define other quantities — such as velocity — so defining time in terms of such quantities would result in circularity of definition. An operational definition of time, wherein one says that observing a certain number of repetitions of one or another standard cyclical event (such as the passage of a free-swinging pendulum) constitutes one standard unit such as the second, is highly useful in the conduct of both advanced experiments and everyday affairs of life. The operational definition leaves aside the question whether there is something called time, apart from the counting activity just mentioned, that flows and that can be measured. Investigations of a single continuum called spacetime bring questions about space into questions about time, questions that have their roots in the works of early students of natural philosophy.

Mexican people (Spanish: Pueblo mexicano (collective), Mexicanos (individuals)) refers to all persons from Mexico, a multiethnic country in North America, and/or who identify with the Mexican cultural and/or national identity.

Mexico became a nation in 1821 when Mexico achieved independence from the Spanish Empire; this began the process of forging a Mexican national identity that fused the cultural traits of indigenous pre-Columbian origin with those of European, particularly Iberian, ancestry. This led to what has been termed "a peculiar form of multi-ethnic nationalism"

The most spoken language by Mexicans is Mexican Spanish, but many also speak languages from 62 different indigenous linguistic groups and other languages brought to Mexico by recent immigration or learned by Mexican immigrants residing in other nations. Over 78% of the Mexican people live in Mexico but there is a sizable diaspora with nearly 22% living in the United States.

The Mexican people have varied origins and an identity that has evolved with the succession of conquests among Amerindian groups and by Europeans. The area that is now modern-day Mexico has cradled many predecessor civilizations, going back as far as the Olmec which influenced the latter civilizations of Teotihuacan (200 B.C. to 700 A.D.) and the much debated Toltec people who flourished around the 10th and 12th centuries A.D., and ending with the last great indigenous civilization before the Spanish Conquest, the Aztecs (March 13, 1325 to August 13, 1521). The Nahuatl language was a common tongue in the region of modern Central Mexico during the Aztec Empire, but after the arrival of Europeans the common language of the region became Spanish.