What is an SVG Logo?
SVG stands for Scalable Vector Graphics. Using an SVG logo within your theme means that your logo will never appear blurry, pixel-y, or low quality, regardless of the screen size.
Ask your graphic designer to export your logo to an SVG image file. In order to use within Solodrop, copy the file contents of the SVG file (you can do this by opening the SVG image in any text editor software) and paste in the SVG logo text input in the theme customizer.