Capacitors are electrical components that are the basis of any electrical circuit. They are two electrically charged conductors separated by a dielectric such as paper, plastic, glass, air, or other material that is a weak conductor. A field is created between the two wires in which electrical energy can be stored. This conserved electrical energy can be used in compensating for dips in the electromagnetic field. The capacity of stored electrical energy is measured with the unit farad.
Trimmer capacitors are usually round capacitors with soldering tips and their characteristic is that they have variable capacitance. They are non-linear electronic elements. What distinguishes trimmer capacitors from other capacitors is that their capacitance can be adjusted, usually with a screw that can be adjusted with a screwdriver. Another important element is that they are bulkier in size and take up more space.