Every vape uses some kind of heating element to atomize vape juice, and whether it's in a pod or a tank or whether it's wire or mesh, it will need to be replaced when it wears out. Vape coils are almost always device exclusive, meaning your vape uses a specific type of coil and won't work with coils designed for other vapes.
The most common resistance wire that's used to make vape coils is Kanthal, which provides good heat and flavor. NiChrome is also somewhat common and behaves similarly to Kanthal, though it often provides better flavor. Coils made of Kanthal or NiChrome are rarely labeled as such, so if your coils don't specify, they're likely one of these two materials. Stainless Steel is also becoming very common, with most vape companies offering some kind of SS316L coil which can be used in either wattage or temperature control modes.
Regardless of what your options are, it's usually best to experiment with different coil types to find one that suits your taste and vaping style. The 48 piece coil set is a great place to start for anyone wanting to experiment with an RDA, RTA or RBA, as there are many different styles from clapton coils to juggernaut coils, and the cost per coil is extremely low.