H0 is a popular scale used in model railroading, representing a ratio of 1:87. This means that one unit of measurement on the model corresponds to 87 units in real life. H0 models typically feature detailed locomotives, cars, and scenery, making them appealing to hobbyists and collectors. The H0 scale is widely recognized for its balance between size and detail, allowing for intricate layouts in relatively small spaces. It is one of the most common scales in the hobby, alongside others like N scale and O scale, and is often used in both beginner and advanced model train setups.