What is Agile
The dominant way software teams organize work: short cycles, frequent releases, and plans that adjust as the team learns.
In plain terms
Agile replaced long upfront project plans with short cycles and steady feedback. Scrum is its most ritualized form, with sprints, standups, and retrospectives. Kanban is a looser continuous-flow version. Most job descriptions that say 'agile environment' mean some blend of the two.
What it tells you about a developer
Agile fluency signals experience on collaborative product teams. It carries no information about coding ability, so treat it as a team-fit data point and read their actual work for technical depth.