Gene trapping is a way for scientists to find out where a gene is located in a cell and how it works. They do this by putting special pieces of DNA into the cell. Sometimes, the DNA will get stuck in a gene in the cell. The gene then changes, which makes it easier for scientists to study it. They can use the gene trapping to find out which proteins are made by the gene, or how it works in different conditions. It's like putting a trap inside the cell to see what gene it gets stuck in.