.svg
what is an svg file?
The svg file extension is a vector image file type. Vector images are made to cleanly scale to different sizes without loss of quality.
download svg sample file

ffc.svg example file is licensed CC0, Public Domain Dedication
svg file extensions
.svg
svg file extension name
Scalable Vector Graphics
svg file type
primary: image
secondary: vector image
svg file structure
Svg files are generally composed of a series of smaller geometric images that are defined mathematically instead of of pixel-by-pixel.
associated organization
W3C
svg format specification and identification
Vector images are defined mathematically. A simple SVG file is easy to break down into its component parts. Take a look at the first 26 lines of a simple SVG file below:

The first 9 lines are version and format specification, and meta information about SVG files more generally. 10-12 define the viewbox and dimensions of the image that will be drawn in the next section.
The image being drawn by the SVG is a small 10px by 10px pinkish square:

svg MIME type
image/svg+xml
svg file signature hex
None/Varies
svg ISO 8859-1
None/Varies
svg offset
None/Varies
svg magic number
None/Varies
svg file character encoding / charset
us-ascii