You trace it or fill in the inside to make a shape or symbol of some sort easily and quickly, and with no artistic ability.
a stencil is a tracing paper which has different pictures you can trace. for example this animal he is a cut out for tracing in between of the animal is cut out so you can trace from inside it.
With a knife.
Nail stencils are designs that they put on your nails.
it like a kind of art set with 115-170 stencils and paint and also paper its really cool i got mines from Micheals
you draw a design and cut it out with a blade n then the remanding parts are placed on a fabric an you use ink to print it onto the material.