Interpolation

Interpolation[{f1,f2,…}] constructs an interpolation of the function values fi, assumed to correspond to x values 1, 2, … . 

Interpolation[{{x1,f1},{x2,f2},…}] constructs an interpolation of the function values fi corresponding to x values xi.

Interpolation[{{{x1,y1,…},f1},{{x2,y2,…},f2},…}] constructs an interpolation of multidimensional data.

Interpolation[{{{x1,…},f1,df1,…},…}] constructs an interpolation that reproduces derivatives as well as function values.

Interpolation[data,x] find an interpolation of data at the point x.

Please visit the official Wolfram Language Reference for more details and examples on core symbols.