This document provides an overview of open access publication. It defines open access as research literature that is freely available online without financial, legal or technical barriers. It discusses the two main routes to open access - open access publishing ("gold" route) where articles are published in fully open access journals, and author self-archiving ("green" route) where authors archive their work in open repositories. It covers topics like open access models, article processing charges, copyright and licensing, and publisher policies regarding self-archiving. The presentation aims to help researchers understand open access and consider their options for making their work openly available.