During the process of replication of DNA, each of the parental DNA strands is used as a template. The strand which is elongating from the template in 3'→5' direction will grow continuously but the strand which is growing from template having polarity 5'→3' will grow discontinuously because RNA primer will be formed at 5' end only so discontinuous strand will require many RNA primer and strand will be synthesised in small segments or Okazaki segments.