Google Images is a quick and easy way to find lots of images from web pages across the globe. But it only searches web content that it can find -- many images are actually hidden in databases or archives (whether freely available or in Cornell's subscription databases). The quality of images - size, resolution, description, usage rights - also varies considerably on the open web. Use Google, but don't rely on it for all image searches. Explore this page and Cornell's image databases for more high-quality options.
Flickr is a public photo-sharing site with billions of images. It is a rich resource to find images for your research (news events, places, people, etc.). Flickr users can opt to share their images with others under creative commons licenses (alternative to copyright).
Creative Commons helps creators share their work. With a Creative Commons license, you keep your copyright but allow people to copy and distribute your work provided they give you credit -- and only on specificed conditions (e.g. non-commercial, non-derivative, share-alike).
Tip! Images produced by the federal government are in the public domain. You can use them without seeking permission. To be certain, check image rights statements.
Search Google Images and limit to .gov
dorothea lange site:.gov
"White Angel Breadline" by Dorothea Lange. Source: The National Archives (archives.gov)
Victoria Crater at Meridiani Planum. NASA/JPL/UA.
Other NASA images