In the films, the 00 section is a discrete area of MI6, whose agents report directly to M, and tend to be sent on special assignments and troubleshooting missions, often involving rogue agents (from Britain or other countries) or situations where an "ordinary" intelligence operation uncovers or reveals terrorist or criminal activity too sensitive to be dealt with using ordinary procedural or legal measures, and where the aforementioned discretionary "licence to kill" is deemed necessary or useful in rectifying the situation.
The 00 section in the movies is a distinct part of MI6, comprising agents who report directly to M and are usually sent on high-stakes operations and crisis management missions, often involving rogue agents or situations where conventional methods are insufficient to address sensitive terrorist or criminal threats.