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Before segments, the only way to say “these people” was to upload a CSV into one campaign — and that list belonged to that campaign. The next one needed the file again, by which time the file and your database had drifted apart. Segments

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Membership is what you put in it

A segment does not change on its own. That is deliberate rather than a limitation: a segment whose members were recomputed would change under a running campaign, and somebody who matched the rule after the dialler had already passed them would be called by a list they were not on when it started.

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Filling one

1

From the contacts screen

Filter to the people you want, then Add to segment. The dialog states how many contacts it is about to add before the button — the whole risk of a filter-shaped action is adding people you did not realise were in view.
2

From a CSV import

A campaign’s import can name a segment, and everyone in the file joins it. This is the one place a bulk grouping happens without anybody choosing people, because the file already is the group.
3

One at a time

A contact’s editor shows the segments they are in, with an add and a remove.
There is no tick-box selection on the contacts table. A tenant with fifty thousand contacts could not tick them one at a time, so the unit of “these people” is the filter already on screen — which is also what makes the count in the dialog trustworthy.

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Deleting one

Removes the group, never the people — and never a campaign already loaded from it. A campaign copies its call list out of a segment rather than reading it live, for the same reason membership is static.