Open Access Week (23-29 October 2023) was a great opportunity to consider what open access (OA) means, how the transition is going, and what鈥檚 next. Since its introduction, publishing OA has proven to have demonstrable impacts on the usage, accessibility, and engagement with research, ensuring that key knowledge 鈥 such as that around the UN Sustainable Development Goals 鈥 can be accessed and used by all, some even influencing policy change.