Mayo holders are containers used to store mayonnaise. They come in a variety of shapes and sizes, ranging from small jars to large buckets. The term 'mayo holders' is often used to refer to the jars that are used to store mayonnaise. These jars are typically made of glass or plastic and have a lid to keep the mayonnaise fresh. Mayo holders are an essential item in any kitchen, as they provide a convenient way to store and access mayonnaise.