A website that publishes tournament data - starting lists, round pairings, standings and cross tables - uploaded by the organizers of the events themselves.
For a player the most practical use is the first one: looking up an opponent's recent events before a game tells you more than a rating number does.
Publication is a function of the tournament software rather than something done on the site by hand.
Which means the real prerequisite is the software, not the site - about Swiss-Manager.
A club evening has a different requirement: players want to see the table on their phones between rounds, not after the event in a public archive.
Publishing on a public archive becomes worthwhile once your events are rated and players want the results attached to their record - which is a different stage of a club's life - starting a club.
A public website that archives tournament data - starting lists, pairings, standings and cross tables - uploaded by the organizers themselves. It covers everything from elite events to small regional opens and is free to read.
Through the tournament software rather than by hand: run the event in a program that supports upload, register the tournament on the site, and upload after each round. In practice this means using Swiss-Manager.
No. It displays what an event produced; ratings are administered separately by federations. Publication on the site is also not evidence that an event was rated.
Yes, and it is the site's most practical use: you can see which events somebody played, their results and their opponents. Before a game that tells you more about an opponent than a rating number does.
Generally not. An archive of official events is not where your regulars will look for last Thursday's standings - an app, a group chat or your own club page serves them better. It becomes worthwhile once your events are rated.
The Vibe Chess app opens from a link and needs no installation. Setting up a tournament takes a minute: pick the system, set the date, the venue and the time control - the app handles the rest.
The bot is constantly improved based on real tournaments. If you need a feature that isn't there yet, message the developers right inside the bot with the /support command. Many features appeared exactly because organizers asked for them, and useful ideas get added quickly.
Software - Swiss-Manager, Vega, JaVaFo, Lichess Swiss.