The Blue Plate Meal Service involves dividing a plate into sections and serving preset portions of food in each section. It originated in the early 1900s using actual blue plates. Advantages are convenience and being economical for small spaces or tables, while disadvantages include limited choice and fixed portion sizes. The food is cooked and plated in the kitchen then served to diners seated at their tables. It was popular for family meals and children's parties due to its ease and is considered a precursor to modern fast food service.