iPhone applications are individual applications that do different things. Developers from across the world design and implement applications to do things like edit pictures, connect with friends, etc. The majority of applications are games, whereas others are utilities. See 'related links' below.
There are 15,000 Applications!
Almost all of the applications on the iTunes store is compatible with the iPhone 4. Exceptions are applications which are for the iPad.
Yes.
Two of the highest seeling iPhone applications include Text Lingo and Angry Birds. See 'related links' below.
No
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Yes, iPhone from Apple. It's just got more applications added onto it!
Using iTunes, you can store songs, movies, applications, games, podcasts, and photos on an iPhone.
Both YouTube and Truveo have dedicated iPhone video applications.
The iPhone is now much more than just a mobile phone. It has spearheaded a revolution in mobile computing. The runaway success of the Apple App Store is testimony to the fact that users are becoming ever more comfortable with mobile applications. Enterprises and users alike have realized the massive potential of iPhone apps. iPhone applications includes Business Applications Multimedia Apps Web Applications Fun & Games etc
The iPhone has thousands of free applications, including food diary applications. Fatseeker and GoMealsHD are two apps that are free and have received good reviews. There are many more using the search feature on the iPhone as well.
Some good mobile applications for your iPhone 4 include urbanspoon and yelp. I use them all the time to find places to eat.