The product is an e-book. It is a guide to using the social network "Twitter". The e-book walks you through setting up an account all the way through using the service and advanced usage. This book will allow the reader to take advantage of all the benefits of Twitter.
In addition to all the definitions from Merriam-Webster's Collegiate Dictionary, this app offers voice search - to let you look up a word without having to spell it - along with synonyms, antonyms, example sentences, Word of the Day, and more.