A sampling technique in which initially sampled respondents contact and recruit others in their social network for participation in the research is called

Snowball sampling has initially chosen respondents recruit others from their social networks.

It suits hidden or hard-to-reach populations where no sampling frame exists.

Convenience sampling simply takes the most accessible individuals.

Quota sampling fills fixed category quotas by non-random choice.

Systematic sampling picks every kth unit from an ordered list.

Being referral-driven, snowball samples carry a strong risk of network bias.