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The description on its file description page there is shown below.
Summary
DescriptionImagine all images described- Alternative text to images as cohesively structured data on Commons.pdf
English: When images are used to illustrate Wikimedia articles, but have inadequate descriptions, the article is considered low in its accessibility for readers with visual impairments who use screen readers. The majority of images in Commons and on our articles have limited or missing text descriptions. Our hope is that, through collaborations between people and organizations who care about improving accessibility, we can create systems for making sure all incoming images, and those already on commons, get adequate descriptions, suitable for not just our English readers, but translatable for all of our movement projects.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.