What are part to part and part to whole ratios?

Part-to-part ratiOS compare two distinct parts of a whole, indicating the relationship between them. For example, in a ratio of 2:3, for every 2 parts of one element, there are 3 parts of another. In contrast, part-to-whole ratiOS express the relationship of a part to the entire set, such as a ratio of 2:5, which means that the part constitutes 2 out of a total of 5 parts. Both types of ratiOS are useful for understanding proportions in various contexts.