There are many different apron forms depending on the purpose of the apron. A basic distinction is between waist aprons which cover the body from the waist down and a bib apron which also covers the upper part of the body.
An apron is usually held in place by two ribbon-like strips of cloth that are tied at the back. A bib apron may either have a strap around the neck (perhaps the most widespread use today), or shoulder straps that criss-cross at the back and attach to the waistband. The advantage of the former design is that it makes it especially simple to put on the bib apron. The advantage of the shoulder strap design is that it makes the apron more comfortable to wear; a neck strap can slightly impair ease of movement.
Some modern day aprons will have humorous expressions, designs or corporate logos.