Residual value/Salvage value/ Scrap value

What is the difference between residual value, salvage value, and scrap value?

The terms residual value, salvage value, and scrap value are often used when referring to the estimated value that is expected at the end of the useful life of the property, plant and equipment used in a business. This estimated amount is used to calculate the asset's depreciation expense and it is often assumed to be zero.

Reference: accountingcoach.com