Help:Insert an image
For convenience, we use the term "image", because it is mainly images that are present in the articles. The method presented also allows you to insert videos or files in certain formats (pdf, for example).
Add a picture
To add an image to an article, the image must already be present on Wikimedia Commons, the media library shared by all Wikipedias.
If the image you want to place in an article is not present on Wikimedia Commons, you can import it there and then insert this image into the article. Be careful, there are many special cases: only very old images (in the public domain) or images taken by you will be accepted; see the details.
How to insert an image already on Commons?
For more explanation on the difference between the 2 interfaces, see Help:Editing tools
Wikipedia:Image Usage Agreements