Gradient Ramp is a texture map that can easily create and edit gradients useful in many different situations.

Type – Specifies the type of gradient ramp to create:

Four corner – A gradient that transitions linearly between colors assigned to each corner. 
Box – A gradient with a box radial transition.
Diagonal – A gradient with a diagonal transition.
Linear – A gradient with a simple linear transition.
Mapped – Specifies a map to use as a gradient.
Normal – A gradient based on surface normals and the camera.
Pong – A gradient with a diagonal transition that repeats in the middle.
Radial – A gradient with a radial transition.
Spiral – A gradient with a circular transition.
Sweep – A gradient with a linear sweep transition.
Tartan – Creates a gradient with a plaid pattern.
Position – Allows the user to specify a Gradient Position.

Gradient Position – Specifies the position of color in the gradient that is returned when Type is set to Position.

Type – Specifies how the colors are randomly distributed across the gradient.

Regular – A plain noise with a non-fractal function.
Fractal – A fractal algorithm to generate the noise.
Turbulence – A turbulence based noise type is used.

Amount – How much noise is introduced.

Size – The scale of the noise.

Phase – Controls the speed of the procedural's noise.

Low Threshold – Sets the low threshold.

High Threshold – Sets the high threshold.

Smooth – The amount of smoothing of the noise.