 To build sustainable, strong and resilient societies we need to be able to access and share knowledge openly. Open Educational Resources allow us to do so. Open Educational Resources, OER, are teaching, learning and research materials in any medium, digital or otherwise, that reside in the public domain or have been released under an open license that permits no-cost access, use, adaptation and redistribution by others. An open license respects the intellectual property rights of the copyright owner. It provides permissions granting the public the rights to access, reuse, repurpose, adapt and redistribute educational materials. Open Educational Resources support quality education that is equitable, inclusive, open and participatory. Open Educational Resources are central for the development of inclusive knowledge societies and to help achieve the 2030 Agenda for Sustainable Development, especially to reach SDG4, SDG5, SDG9, SDG10, SDG16 and SDG17. To support universal access to information and knowledge and to transform economies and societies it is important to innovate. To foster innovation, one of the major challenges is to create the conditions for access to and use of quality knowledge. Because Open Educational Resources are free to access, reuse, repurpose, adapt and to redistribute they can reduce the cost for development of educational materials, be adapted easily to different learning contexts and help to develop gender-sensitive materials and alternative and accessible formats for learners with special needs. Governmental and institutional investments can be enhanced for socio-economic growth by accessing a variety of innovative pedagogical options. UNESCO Member States adopted by Consensus a recommendation on Open Educational Resources. This recommendation called for governments, educational institutions, civil society and other groups working with OER to take actions in five areas. First, building capacity of stakeholders to create, access, reuse, adapt and redistribute Open Educational Resources, developing a supportive policy at national and institutional levels, encouraging effective, inclusive and equitable access to quality Open Educational Resources, nurturing the creation of sustainability models for Open Educational Resources and promoting and reinforcing international cooperation. By involving decision makers, institutional stakeholders, including teachers and other stakeholders, we can build capacity to create, access, reuse, adapt and redistribute Open Educational Resources, put in place and support existing supportive policies for Open Educational Resources, support the development of accessible, culturally and linguistically relevant Open Educational Resources to meet the socio-economic needs of societies and encourage the sustainable mainstreaming of Open Educational Resources into lifelong learning systems. Open Educational Resources have a huge potential to ensure inclusive and equitable quality education and promote lifelong learning opportunities for all. By leveraging information and communications technology, we build inclusive, resilient societies.