what is difference between cement and concrete

Althought the terms cement and concrete often are used interchangeably , cement is actually an ingredient of concrete . Concrete is basically a mixture of aggregates and paste . The aggregates are sand and gravel or crushed stone , the paste is water and portland cement .  Concrete gets stronger as it get older . Portland cement is not a brand name , but the generic terms for the type of cement used in virtually all concrete , just as stainless is a type of steel . Cement comprises from 10 to 15 percent of concrte