Log Line: A logline contains one or two sentences that briefly sums up your book. For instance, the logline for my novel 'The Lone Hero' is:
The dragons are warring on their home planet of Aberforth. Only one man, the Lone Hero can put an end to the conflict but it will take him most of his life living through the atrocities of war to achieve this.
Tag Line: Short and hopefully clever one line to promote your book. The example I'll use here is from my novel 'Always':
Always - more than a romance.
Developing your loglines for your novels and remembering will give you the best answer to the question, "What's your book abou