Howard Gardner's theory of multiple intelligences, introduced in his 1983 book 'Frames of Mind,' suggests that humans have at least eight distinct ways of processing information, which are relatively independent from one another. These intelligences include linguistic, logical-mathematical, musical, spatial, bodily-kinesthetic, interpersonal, intrapersonal, and naturalist learners, with Gardner informally considering existential and pedagogical intelligences as well. The theory challenges traditional notions of intelligence, emphasizing the diverse ways individuals perceive and understand the world.