Wedding photographs are a unique and valuable record of the big day. Photography is an area where money is usually well spent. There are many professional wedding photographers, so personal recommendations are often best.
The couple should do their research and work out what style of photography suits their tastes. Contemporary wedding photography usually comprises a mix of both formal portraits and reportage.
It is worth investing in a professional; relying on friends can be risky. The couple needs someone fully dedicated to the task to capture all of the important moments. Wedding photography is expensive, but generally you get what you pay for so is usually money well spent.