Data mapping is very important for businesses today. It connects a source to a target. The source is where the data starts. The target is where the data goes. If the map is wrong, the data gets lost. This causes big problems for people using the information.

First, you must look at your source data. This could be a simple spreadsheet. It might be a large database too. You need to know what every number means. Clean numbers are better than messy ones. They are easier to move and use later.

Next, you check the target system. Every system has its own set of rules. Some systems like short numbers. Others might need long deci