Carbon steel makes a harder and stronger cutting blade than stainless steel, it is also easier to sharpen. In return for its performance carbon steel will need a little bit of love and care, as it will tend to oxidise if not well maintained.
Avoid rusting, it is recommended that carbon steel blades are kept oiled.
Do not soak it in water and never place it in the dishwasher.
To clean, wipe the blade with a damp cloth and dry immediately.