Used mainly for invitations, script fonts can be either formal or casual. Formal script fonts are based on letterforms from the 17th and 18th century generated by a quill or metal nib of a pen. These tools can create both fine and thick strokes. A popular contemporary script font is Snell Roundhand.
Casual script are fonts that are less formal and more active. Instead of a pen, these strokes appear to be created by a wet brush. They first appeared in the early 20th century, becoming widely popular in the 1950s. Often used in advertising, a few examples of popular casual script fonts are Brush Script and Cursive.
Historically, most lettering on logos, shop signs, and displays weren’t based on an individual font (as they are today). Rather they were custom-designed by hand by artists and sign makers, therefore displaying handwritten styles of different historical periods. Many script fonts we see today are based on these styles.