Ethernet cable color coding and their meaning

Ethernet cable is category-5(cat-5) standard cable.

The color and their meaning as follows:-

• Orange pair sends data.
• Green pair receives data.
• Blue and Brown wire are kept for future mainly to increase the bandwidth.

 note :- Blue and brown wires don’t do anything yet, but they will in the
future. The cable standards folks designed CAT-5 with the extra
colored wires so that they could be used for higher bandwidths in
the future.

More wires = more bandwidth

Now we also have cat-5e and cat-6 ethernet cables as well.