Metallized film capacitors are a type of capacitor that utilizes a thin layer of metal (usually aluminum) deposited directly onto a plastic film dielectric. 
They are categorized by the type of film used, with common examples including polypropylene (PP), polyester (PET), and polycarbonate (PC). 
These capacitors are known for their self-healing properties, compact size, and wide range of applications

Metallized film capacitors are available as:

Metallized Polypropylene (MPP)
Metallized Polyester (MEP)
Metallized Polycarbonate (MPC)
Metallized Polystyrene (MPS)

These are also referred to as MKP, MKT and MKC capacitors.

They have wide applications in power supplies, motor control, automotive electronics, industrial automation, audio equipment, lighting circuits, etc.