(1) One color pixel in a CCD or CMOS sensor. See
CCD sensor and
CMOS sensor.
(2) (photo site) A website used for uploading and sharing photos with friends and family. See
photo sharing site.
A Fujifilm Photosite
In Fujifilm's first-generation Super CCD SR technology, each photosite (pixel) comprises two sensors with different sensitivities. See
Super CCD.