Black is the color of objects that do not emit or reflect light in any part of the visible spectrum; they absorb all such frequencies of light. Although black is sometimes described as an "achromatic", or hueless, color, in practice it can be considered a color, as in expressions like "black cat" or "black paint".

The word black comes from Old English blæc ("black, dark", also, "ink"), from Proto-Germanic *blakkaz ("burned"), from Proto-Indo-European *bhleg- ("to burn, gleam, shine, flash"), from base *bhel- ("to shine"), related to Old Saxon blak ("ink"), Old High German blah ("black"), Old Norse blakkr ("dark"), Dutch blaken ("to burn"), and Swedish bläck ("ink"). More distant cognates include Latin flagrare ("to blaze, glow, burn"), and Ancient Greek phlegein ("to burn, scorch"). Black supplanted the wonted Old English word sweart ("black, dark"), which survives as swart, swarth, and swarthy (compare German schwarz and Dutch zwart, "black").

Black can be defined as the visual impression experienced when no visible light reaches the eye. (This makes a contrast with whiteness, the impression of any combination of colors of light that equally stimulates all three types of color-sensitive visual receptors.)

The term black people is used in some socially-based systems of racial classification for humans of a dark-skinned phenotype, relative to other racial groups represented in a particular social context. Different societies apply different criteria regarding who is classified as "black", and often social variables such as class and socio-economic status also play a role, so that relatively dark-skinned people can be classified as white if they fulfill other social criteria of "whiteness" and relatively light-skinned people can be classified as black if they fulfill the social criteria for "blackness" in a particular setting.

As a biological phenotype being "black" is often associated with the very dark skin colors of some people who are classified as "black". But, particularly in the United States, the racial or ethnic classification also refers to people with all possible kinds of skin pigmentation from the darkest through to the very lightest skin colors, including albinos, if they are believed by others to have African ancestry, or to exhibit cultural traits associated with being "African-American". As a result, in the United States the term "black people" is not an indicator of skin color but of socially based racial classification.

Uncle Tom is the title character of Harriet Beecher Stowe's 1852 novel, Uncle Tom's Cabin.

The phrase "Uncle Tom" has also become an epithet for a person who is slavish and excessively subservient to perceived authority figures, particularly a black person who behaves in a subservient manner to white people; or any person perceived to be a participant in the oppression of their own group.

At the time of the novel's initial publication in 1851 Uncle Tom was a rejection of the existing stereotypes of minstrel shows; Stowe's melodramatic story humanized the suffering of slavery for White audiences by portraying Tom as a Christlike figure who is ultimately martyred, beaten to death by a cruel master because Tom refuses to betray the whereabouts of two women who escape from slavery. Stowe reversed the gender conventions of slave narratives by juxtaposing Uncle Tom's passivity against the daring of three African American women who escape from slavery.

The novel was both influential and commercially successful, published as a serial from 1851-1852 and as a book from 1852 onward. An estimated 500,000 copies had sold worldwide by 1853, including unauthorized reprints. Senator Charles Sumner credited Uncle Tom's Cabin for the election of Abraham Lincoln and Lincoln himself reportedly quipped that Stowe had triggered the American Civil War.Frederick Douglass praised the novel as "a flash to light a million camp fires in front of the embattled hosts of slavery". Despite Douglass's enthusiasm, an anonymous 1852 reviewer for William Lloyd Garrison's publication The Liberator suspected a racial double standard in the idealization of Uncle Tom: