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Original file (SVG file, nominally 72 × 72 pixels, file size: 1 KB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Specifying a size does not just change the apparent image size using HTML; it actually generates a resized version of the image on the fly and links to it appropriately. This happens whether or not you specify the size in conjunction with "thumb". This means the server does all the work of changing the image size, not the web browser of the user.
Images, audio and video files must be uploaded into Wikipedia using the "Upload file" link on the left-hand navigation bar. Only logged in users can upload files. Once a file is uploaded, other pages can include or link to the file. Uploaded files are given the "File:" prefix by the system, and each one has an image description page.
One color entry in a single GIF or PNG image's palette can be defined as "transparent" rather than an actual color. This means that when the decoder encounters a pixel with this value, it is rendered in the background color of the part of the screen where the image is placed, also if this varies pixel-by-pixel as in the case of a background image.
Most images in Wikipedia articles are scaled down thumbnails. A reader of an article can click on the thumbnail, or on the small double-rectangle icon (if present) next to the caption, to see the corresponding file page and the image at a larger size. From the file description page, click the image again to see it at maximum size.
9 September 2007 (original upload date) Source: Transferred from en.wikipedia: Author: Original uploader was XXV at en.wikipedia. Later version(s) were uploaded by Jjalocha, Aihtdikh at en.wikipedia. Other versions: Derivative works of this file: Vector Video Standards 3.svg; Vector Video Standards2-2010-16-04.svg; Vector Video Standards3.svg
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PNG is a raster graphics format, encoding the value of each individual pixel, while SVG is a vector graphics format that encodes an image as a series of geometric shapes. If this confuses you, don't worry; you don't need to understand the technical aspects to create or upload images.