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A group is a named list of contacts. Membership is assigned, not derived — a contact is in a group because someone put them there.

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The list

Each group shows its name, a description, how many contacts it holds, and when it was created. New Group creates one. The description column is worth using. A group called “VIP” tells the next person nothing about who belongs in it or who decides; one sentence there saves an argument later.

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Group or segment

The two exist because membership can be either a decision or a fact, and they are not interchangeable. Use a group for “beta testers”, “escalate to Anna”, “gave consent at the trade fair” — things no rule can work out. Use a segment for “wrote in the last 30 days”, “speaks Polish”, “never completed onboarding” — things nobody should have to maintain by hand.
The failure mode of groups is staleness: a hand-maintained list is correct on the day it is made and drifts from then on. If you find yourself periodically reviewing a group to add and remove people by rule, that rule is a segment.

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Using them

Groups can target a broadcast and can be tested inside a flow, the same way tags and segments can. What differs is only how membership is decided.