Tinder and Kindling are the things you use to start a fire. Tinder would be something you brought with you or small twigs the size of pencil led. Kindling would be something like dry stick the thickness of your thumb. The logs would be no bigger than your wrist or would be the size you can break with your hands.
Somethings that you might bring with you might be fatwood, cotton balls or wetfire. Fatwood comes from pine stumps and contains a lot of resin. Wetfire is a small block of chemical tinder that will burn even if it is floating in water.
This is char cloth. We mentioned it when we talked about Fire Pistons. It is a very old tinder material. It is made by baking cotton cloth in a way that air cannot get to it. What is left behind is mostly carbon and will work as tinder. Native Americans made char cloth using oyster shells to bake it in. Char cloth works great, but its tricky to make and it must be kept dry.
This is a magnesium block. Magnesium is a soft metal that you can shave with a knife. The shavings burn very hot and can be lit with a spark. This one has a fire steel right on the side. No matter how wet this gets, it will still work.
There are dozens of store bought or homemade kinds of tinder that you can use. Waxed cotton, frayed twine, dryer lint, birthday candles, and chapstick are examples of things you can bring.
If you are for some reason you are Not Prepared, you can make a feather stick. This is an effective tinder material
If you are lucky, you might find on old birds nest. These are great tinder. Birch bark is also great tinder, but you should only use birch bark in an emergency because it is not good for the tree