Should I use a leader when fishing?
A leader line for fly fishing is essential because the heavy colored fly line used to cast lightweight flies is too thick for tying on the small flies and is easily detectable by fish.
What is the difference between fishing line and leader?
A leader is a length of monofilament line tied to the end of the main line that is on your fishing reel. It can be a metre long if you fish for bream and whiting or it can be 6 or 7 metres long if you gamefish. It can be lighter than your main line or it can be much heavier than your main line.