It depends from conference to conference, but generally speaking "keynote" means: - The very first or very last talk of the day. - A larger time slot, look

It depends from conference to conference, but generally speaking "keynote" means: - The very first or very last talk of the day. - A larger time slot, looking at the Rustconf 2022 schedule, keynotes are 45 minutes long, regular talks 30 minutes. https://2022.rustconf.com/schedule - The speaker is featured much more prominently in the promotional materials. - If the conference has multiple tracks, no other talk are scheduled at the same time than keynotes. It's assumed all conference attendees will hear the keynote.