Convert your logo from a raster type image such as JPEG, PNG, PMP to a scalable vector graphic such as EPS, SVG or PDF. Your logo will stay high resolution with crisp lines and colors no matter how much the user will zoom in on your page. The logo will always be displayed in the professional image it was intended for.
Technical mumbo jumbo:
Vector graphics is the use of geometrical primitives such as points, lines, curves and shapes to represent images in computer graphics. Vector graphics are based on vectors (also called paths) which lead through locations locations called control points or nodes. Each of these points has a definite on the axes of the work pane and determines the direction of the path and each path may be assigned a stroke color, shape, thickness and fill. The properties don’t increase the size of vector graphics in a substantial manner.