Codes
When techinal elements such as camera, sound, mise-en-scene, editing or special effect are used to communicate with and lead the audience to expect certain things.
Conventions
Its when you expect something to happen in a certain genre of a film. For example 'horror' you expect killing, thunder, a group of people or a weapon.
Conventions of Horror
Blood
Darkness
Screaming
Thunder
Groups of friends
Low music
Weapons
Maskes
Accidents
Murder
Ghosts
Action
Car chasing
Villian
Hero
Happy ending
Explosions
Set in exotic countries
Pretty girl
Guns
Police
Money
Western
Horses
Deserts
Cowboys
Guns
Deserted town
Bar
Boots
Hotness
Cactus
