Per BSides:

"Each BSides is a community-driven framework for building events for and by information security community members. The goal is to expand the spectrum of conversation beyond the traditional confines of space and time. It creates opportunities for individuals to both present and participate in an intimate atmosphere that encourages collaboration. It is an intense event with discussions, demos, and interaction from participants. It is where conversations for the next-big-thing are happening. "

The BSides Adelaide event in 2025 is following that tradition by operating in an ‘open spaces’ format. This varies from structured presentations to smaller break-out groups, through to workshops and capture the flag events; any medium that provides a direct connection between members of the cyber security community, across the entire spectrum of beginners to experts.

For an idea of what BSides means to others, check out "What does BSides mean to you?"