The electronic color code is used to indicate the values or ratings of electronic components, usually for resistors, but also for capacitors, inductors, diodes and others. A separate code, the 25-pair color code, is used to identify wires in some telecommunications cables.
Standard Resistor and Capacitor values with IEC and EIA code is explained in previous post.
This tool is used to decode information for color banded axial lead resistors. Select their colors to determine the value and tolerance of the resistor.