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A digital single-lens reflex camera (also called a digital SLR or DSLR) is a digital camera that combines the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor, as opposed to photographic film.
A DSLR would be best for portraits, entry level models would be the Nikon D40 or Canon EOS-1000D...or perhaps the Pentax line. 85mm fixed lens is a good choice. You can get a compact like the Canon SX1 that has a decent zoom. Just depends on whether you are looking for pro results or casual snapshots/portraits. Some of my best ever candid portaits were with an Olympus C2100UZ, a 2MP 10X zoom camera.