Why does a replication fork have a leading and lagging strand?

Question

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DNA synthesis always proceeds in the 5' to 3' direction, which means that the two strands of the double helix have opposite orientations. One of the strands, known as the leading strand, can be continuously synthesized in the same direction as the replication fork, while the other strand, known as the lagging strand, must be synthesized in the opposite direction in a series of shorter segments known as Okazaki fragments. This is because DNA synthesis requires a template strand and a primer to begin, and these can only be added to the 3' end of a growing DNA strand.

Why Does a Replication Fork Have a Leading and Lagging