What is Trip Planner for?

I just want to know what it is for. For example, if you have a friend who is a travel agent, can they sell trips with this? Or is this simply a chronicle of what you did at your destination?|||"Trip Planner is a tool on Yahoo! Travel that lets you save hotels, attractions, restaurants, maps and more to a customized travel guide. You can add travel dates, your own comments, even bookmarks for other sites to your trip. Once you've created your trip, you can print a copy to bring with you, or access it from any computer with Internet access."|||so that you can have a way to plan trip get coupons and see if they have space available..make resurvations and ythings like that