Snowball sampling can be done in many ways, but generally it is when a group of people select few participants who are willing for study . Those participants then recruit other participants, and so on, this is like when a snowball coming down a hill, it's size increases similarly the number of participants in group also increase.
Snowball sampling, is a type of convenience sample. If you are searching for a group of people for certain task than find one person who qualifies to participate, ask him or her to recommend several other people who have the knowledge you are looking for, and participant list can grow from there.
Snowball is group of techniques. Chaining is one of them.
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