WHAT IS A RATIO?
In general, a ratio is a way of concisely showing the relationship between two quantities of something. The most formal way of stating a ratio is by separating the two quantities with a colon (:).
A ratio is a comparison of two numbers. We generally separate the two numbers in the ratio with a colon (:). Suppose we want to write the ratio of 4 and 3. We can write this as 4:3 (common ratio for data) or 16:9 (common ratio for video material)