Concept Splines is a piece-wise polynomial 𝑠(𝑥)|Ω𝑗=𝑎𝑗+𝑏𝑗𝑥+𝑐𝑗𝑥2+𝑑𝑗𝑥3+… where Ω𝑗 is 𝑗-th domain, every domain has their own function.