Blond beer is a rather vague term. Many different types of beer are 'blonde' in color, for example the majority of the IPAs, many 'wild' and sour beers such as lambic and gueuze, pilsners, saisons, etc.
What is usually understood by blond beer is a light, golden beer of top fermentation, fermented with Belgian yeasts. They give a soft sweet, slightly fruity touch to the beer. Well-known brands are, for example, Brugsche Zot and Leffe Blond.
In addition to blond, you also have the beer type 'strong blond'. These are golden yellow beers with an alcohol percentage of around 8%. These are beers that are reminiscent of the famous Belgian Tripel, but they are a lot drier and more hoppy in taste. Think for example of the Duvel and La Chouffe.