A plated salad may have as many as four parts: base, body, dressing, and garnish. All salads have body, and most have dressing, but base and garnish are parts of only some salads, as you will see in the following discussion.
Of course this discussion refers only to individual plated salads. When we use the term salad to refer to a bulk mixture, as in “two pounds of potato salad,” references to the four parts of a salad do not apply.