Difference between a Bedspread, Sheet and Blanket

A sheet is a thin square piece of fabric, usually matching the fitted sheet (this goes around the bed to separate the sleeper from the mattress), that is like a blanket, but provides very little cover.

A bedspread is usually just a blanket of medium thickness that is used primarily to decorate the bed.

A blanket is of some thickness (not usually thin like a sheet, but it can range from close to thin to very thick) that is used for warmth.

In blankets, which weave is the warmest?
A conventional weave blanket is the best for warmth and insulation. Its tightly woven fibers, usually made of synthetic or wool, trap air beneath the blanket against the body.

What is the difference between a blanket and a throw?
The difference is the size. Blankets are usually sized like comforters: Twin, Full/Queen, etc. Throws typically measure 50″ x 60″. Some throws “for two” measure 50″ x 70″.