Vector format is THE mandatory format for a logo. Because a vector image is made up of elements linked by mathematical formulas rather than pixels, it's possible to enlarge your logo without any loss of quality. So, if you want to print your logo on a giant tarpaulin several meters high, this is perfectly possible thanks to the vector format. This file won't necessarily be useful for you, but it will be for all future service providers working on your graphic projects (printers, graphic designers, etc.).