Sand: Sand is a Kekkei Genkai formed so as to be able to control sand just like Shukaku. The most known user being Gaara. Gaara can control any sand but also keeps chakra infused sand in a gourd he keeps behind him. This chakra makes the sand faster
Since Sand contains minerals of different kinds, it can withstand strong attacks. Sand can be used to exert influence over over people.
Though sand is strong,it also have weaknesses like Deidera inserting explosive clay in the manga, Gold dust and oil.
Sand is strong over fire release. It is the only thing even amaterasu(highest level of fire release has been yet to burn through)
Users of Sand in Naruto include Gaara, 3rd Kazekage(iron sand)
Combination: add wind and get dust release