# Concepts of formula and formula type

## Formula concept

Generally speaking, a formula is an expression that allows handling the data using mathematical functions .

## Data

There are different types of parameters to handle, depending on the working context: geometric parameters, input/output parameters, space quantities.

Consequently, there are different formula types : formulas with geometric parameters, formulas with input/output parameters, and formulas with spatial quantities.

The different formula types and their use are specified in the following sections.