You can find out anything in the internet these days. A single click in Google and you can have all your reference materials. But what about those times when you're not connected to the Internet? What will you do if the Wi-Fi fails during Quiz Night at your favorite pub? Here are some of the best free reference apps for your iPad or iPhone.

1. Articles- It may be too much for people who don't want to pay for Wikipedia, but this handy app will make surfing Wikipedia articles easier to read. It also has other interesting features like allowing articles to be viewed offline, map mode to view Wikipedia entries about places nearby, quick lookup of recently viewed articles and a language picker to switch between different article translations.

2. World Atlas HD- This app uses high-resolution maps from National Geographic to make this atlas one of the most beautifully rendered apps out there. The app has three different map styles to choose from and users can get information about various countries with the up to date researched database. The 3D globe can be more entertaining than you would expect. Think of it like the globe you loved to spin in the classroom.

3. IMDB- If you're looking for the name of that guy who starred in that film; then this app is for you. The IMDB app can answer just about any film trivia question you have. It has cast and crew information as well as trivia. Best of all, it's free.

4. Webster's Third New International Dictionary- Any tablet or smartphone needs a good dictionary. The Webster's Third New International Dictionary has more than 700,000 word definitions and the paid version be accessed without an Internet connection. You can search for words even if you're not sure of the spelling. The app also has audio pronunciations as well as usage samples and word etymology.

5. Google Search- Google is available online, but this app brings more features than the popular search engine on the Web. You can search for results by taking a picture on your camera. The app can identify barcodes, products or famous landmarks. You can also get results customized to your location.