10BASE-T is one of numerous physical media specified in the
IEEE 802.3
100BASE-T is the main form of Fast Ethernet; while
Gigabit Ethernet (GbE or 1 GigE) is a word unfolding numerous
technologies for transferring Ethernet frames at a rate of a gigabit per
second.
The main difference is the transmission speeds, which are
10, 100 and 1000 Mbits per seconds for the three Ethernet variations.
