What is the difference between an annuity and a lump sum? How is each one valued?

		Annuity is one cash flow while a lump sum is a series of repeated, equal cash flows; TVM
		Annuity is one cash flow while a lump sum is a series of repeated, equal cash flows; DCF
		Annuity is a series of cash flows while a lump sum is one cash flow; TVM
		Annuity is a series of cash flows while a lump sum is one cash flow; DCF