These are the three types of lighting used in both photography or videography

1. Lighting
Key light
The key light is the main source of light and it tends to be the brightest
light source, it is the one that illuminates the subject.
If shooting an object or a person you always want it to be illuminated.
That is why most of the time the main light source is in front of the
subject, more spastically on the front side around 45 degrees or so.
Fill Light
A fill light is a light source used to fill in shadows caused by other lights
(mainly a key light), but without creating harsh shadows of its own.
Therefore, your fill light should always be diffused. You have several
options for a fill light source depending on your budget, the size of your
space and the key light modifier you are using.
Rim Light
A rim light is a light source placed behind your subject to cast light on
the back of your subject, allowing for some spill to leak around parts of
their body, creating a “rim” of light or “lighted outline” around their
body. This is typically used to separate a subject from a background of
the similar color to what the subject is wearing, to separate multiple
subjects when they are all wearing similar colors and to give depth to
your image.