During DNA replication, the strand is synthesized continuously while the strand is synthesized in a series of short fragments called Okazaki fragments.

During DNA replication, the leading  strand is synthesized continuously while the lagging strand is synthesized in a series of short fragments called Okazaki fragments.

Explanation:

DNA replication does not start at random location but at particular sites called the origins of DNA replication.A unit of DNA where replication starts at origin and proceeds is called a replicon.Each replicon has a replication fork that advances continuously along with advancing replication.At each growing fork two strands are synthesized- a leading strand that is synthesized continuosly  in 5'-3' direction and another lagging strand that is synthesized discontinuously from 3'-5' direction forming fragments of DNA called  Okazaki fragment.

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