Wikipedia:Tip of the day/April 4

Wikipedia encyclopedia articles may be improved by including images as well as sound and video clip media files. It is important to understand where to upload these files.

• Images and other media files must be uploaded either to Wikipedia or to Wikimedia Commons before they can be used.
• If you do not already have a Wikipedia account, you must create one to upload images. The account will work across all twelve Wikipedia sister projects such as the Commons.
• Wikipedia prefers free images that can be reused commercially and modified.
• Non-free images may be used, but only in certain circumstances and if a free equivalent is not possible.
• Wikimedia Commons only accepts free images, which can then be used by any of the other Wikimedia projects.

There is a how-to guide available at Wikipedia:Creation and usage of media files and a picture tutorial that explains how to add images to an article.