What is non probability sampling?

Non-probability sampling is a sampling technique in which the selection of the sample is not based on random selection. This means that not every member of the population has an equal chance of being selected for the sample. Non-probability sampling methods are often used in situations where it is difficult or impossible to obtain a random sample, such as in qualitative research or when studying hard-to-reach populations. Some common types of non-probability sampling include convenience sampling, purposive sampling, and snowball sampling.