# Constraints commands
In OpenSees there are two types of constraints:
- Single Point constraints which prescribe the
movement (typically 0) of a single dof at a node. There are a number of
commands for defining single-point coonstraints:
- Multi-Point constraints which prescribe that the
movement of certain dof at one node are defined by the movement of
certain dof at another node. There again are a number of commands for
defining multi-point constraints.