fire starters
lighters and matches are the easiest, but not always the most reliable some more reliable ones are flint and steel, and magnesium fire starters.
fire
fire is very important in a survival situation as it warms you,can be used to signal rescuers,and cook food,oh and repel animals that might attack.
tinder
tinder is essential to starting fires, it can be dry items that burn easily like the tinder fungus in the picture or things like dried pine needles,dry grass, birch tree bark,and pre made fire starters such as fire tabs.
kindling
these are twigs,small sticks and such that the tinder will light on fire
wood
its the larger peices of wood you put on a fire. the bigger the fire is the bigger the wood used.