A TRIAC is a three-terminal electronic component that conducts current in either direction when triggered. The term TRIAC is a genericised trademark.
A small plastic-cased TRIAC device mounted on a printed circuit board
Figure 4: Equivalent electric circuit for a TRIAC operating in quadrant 1
An electronic component is any basic discrete electronic device or physical entity part of an electronic system used to affect electrons or their associated fields. Electronic components are mostly industrial products, available in a singular form and are not to be confused with electrical elements, which are conceptual abstractions representing idealized electronic components and elements. A datasheet for an electronic component is a technical document that provides detailed information about the component's specifications, characteristics, and performance.
Various electronic components, with a 15 cm ruler to scale.
Various examples of Light-emitting diodes
SMD resistors on the backside of a PCB
Some different capacitors for electronic equipment