Reading Scott Kelby's Digital Photography vol. 1, I came across the following pro tip:
Don't press the Shutter (Use a Cable Release)
I own a Nikon D90, so reading Nikon's help on which remote release can I use with my Nikon D-SLR, I saw the following distinction:
Wired 10-pin terminal remote releases and accessories versus
Remote releases for D-SLR cameras without a 10-pin terminal
What is the use of this 10-pin remote accessory terminal, and why do some DSLRs have one while others don't? Does the D90 have such a terminal?