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Google Images is an image specific search through the Google search engine. Google Images may be helpful if you are looking for images not related to science or biomedicine for posters or presentations. To find the free-to-use images, use the advance image search option. Select the type of license best
suited for your needs (free to use or share, free to use, share, or modify, and commercially). Copyright and license search information can be found here: https://support.google.com/websearch/answer/29508?hl=en&ref_topic=3180360
Pixabay is a community-based photograph sharing site where people share copyright free images and videos. All images and videos are released under Creative Commons CC0. The content can be used without asking for permission or giving credit to the artist - even for commercial purposes. Search the healthcare, health and medicine tags.
Flickr is an online photograph management and sharing application. Like Google Images it is a good source for images not related to science or biomedicine for posters or presentations. Use the license drop down menu to filter for images under creative common licenses. Copyright and license information can be found here: https://www.flickr.com/help/guidelines
The Wellcome Library provides insight and information to anyone seeking to understand medicine and its role in society, past and present. Copyright information can be found here: https://wellcomecollection.org/works
OpenGLAM is a large aggregator for images. The images in OpenGLAM lean more toward humanities; however, it does contain some science content. Like Flickr and Google Images this source could be used to find images for posters and presentations. Copyright information can be found here: http://openglam.org/faq/
Open Image Collections is a large aggregator for images. Like OpenGLAM the images lean more toward the humanities. However, it could be a good source if you are looking for more creative images for presentations.
Copyright information can be found here: https://blogs.ntu.edu.sg/openimagecollections/using-images/