The SpringLinear property of the SpringJoint class defines how springy and tight the joint will be. It is a crucial parameter for simulating realistic spring-like behavior in physics simulations. This property is of type PhysicsSpring, which encapsulates the characteristics of the spring, such as stiffness and damping.

To use the SpringLinear property, you need to have an instance of the SpringJoint class. You can then set or get the SpringLinear property to adjust the spring characteristics of the joint.

Example usage:

SpringJoint springJoint = new SpringJoint();
springJoint.SpringLinear = new PhysicsSpring
{
    Stiffness = 100.0f,
    Damping = 0.5f
};

In this example, a new SpringJoint is created, and its SpringLinear property is set to a new PhysicsSpring with specified stiffness and damping values.