Step 1: Understanding the Concept:
Sampling techniques are broadly divided into probability (random) sampling and non-probability (non-random) sampling.
Step 2: Detailed Explanation:
1. Probability Sampling: Every population unit has a known, non-zero probability of selection (e.g., Simple Random, Systematic, Stratified, Cluster, Area sampling).
2. Non-Probability Sampling: Selection relies on subjective researcher judgment or convenience (e.g., Quota, Purposive, Convenience, Snowball sampling).
Step 3: Final Answer:
Thus, quota sampling is a non-probability sampling method.