Variation
A single fixed-price listing that contains multiple variations of the product. For example, a T-shirt listing could vary by color and size. Each variation specifies a combination of one of these colors and sizes. Options in the listing allow buyers to choose which color and size they require.

Variation Details
The aspects of a listing that make it a variation. For example, If a T-shirt had different colors and sizes then the Variation Details would be Color and Size.

Variation Values
The values that a Variation Detail could have. For example, If a T-shirt had different colors and sizes the Variation Values for Size could be Small, Medium and Large.