Sir John Herschel introduced the term "photography" in the early 19th century. The first permanent photograph was taken in the 1820s by French inventor Nicéphore Niépce using a camera obscura. Cameras have evolved from producing black and white photos to digitally capturing color images. A camera works by light passing through a lens and onto light-sensitive film or a sensor, creating a pattern that becomes the negative or digital image. Composition techniques like rule of thirds, proximity, and point of view impact photo quality. Photography is used in fields like crime scene investigation, wildlife documentation, journalism, and entertainment.