CONTINUITY

What is continuity? 
The maintenance of continuous action and self-consistent detail in the various scenes of a film or broadcast.
Why do i need to know this? The reason a artist needs to full understand what continuity means is to know she/he is do their job right, Before i searched continuity i didn't know exactly what it meant nor did i know why i needed to know about it. 
In my future career i will be experiencing a lot of continuity working on films, TV sets etc... 
Continuity is extremely important in the film and tv making, purely because you need the shots to be exactly the same as the first, such as hair position, clothes, make up; skin tone, lipstick. 
Typical issues with continuity is running out of the product you have used or even lost that; but a professional will always make sure she has a alternative. You should always write down what you have used previous, this is why face charts are important. 
Learning continuity now will help in the future to build confidence to create the exact same look i have done previous, the purpose for this will be sometime the actor will have a hand model, a stunt model, a back view model and you need every single one to be the exact same.