Writing it down will give you 10 in decimal. The
third colour band is the multiplier, which in this case is red.
Red is equal to 100. Multiplying 10 by 100 will give you 1,000 or
as shown above 1K. K stands for Kilo. If you see an M it stands
for Mega, which is equal to 1,000,000. The fourth band is the tolerance
band and indicates a percentage value by which the value of the
resistor can change, for example: a tolerance of 5% on a 1K Ohm
resistor would yield to a value between 950 and 1050 ohms.