Definitely games! For example here are the most popular categories in the App Store ranked in 2015:
1. Game
2. Business
3. Education
4. Lifestyle
5. Entertainment

yes
Definitely games! For example here are the most popular categories in the App Store ranked in 2015:
1. Game
2. Business
3. Education
4. Lifestyle
5. Entertainment

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now a days app development is going on crazy & boom some of the apps for - games, e-commerce, e.t.c

I think:
Retail
Social Media
Travel
etc.

Actually it's easy to find out if you just check out couple blogs of app development companies.The guys always write about trends.
Such blogs:

Blog
Mobile App Development Blog | Mobile Resources Blog | App Development | Appscend
Mobile App Development Blog | Page 1 | ArcTouch

Naturally it is Games.

Mobile app development services and web development services are the most common and famous now a days. You have a good chance to earn money from your small business by running your online business. If you would like to know some development companies then I can recommend you some good names. Send me PM if you are interested.

Social Networking app
Business and Finance apps
Entertainment apps
Interactive Education apps
2D and 3D android games app

Are you looking for Mobile app development ? then, Kindly Contact Me @Openwave Computing NYC

HI there, well there are many types of Apps now a days that are popular, but the "HEALTH AND FITNESS APPS" would be the most searched apps. How many times do we feel like "i am not feeling well today. i wanna rest today", " i am losing my hair follicles very quickly what to do for cure", so here the health and fitness apps help a lot as you know the world is full with touch screens, tablets and more innovations are on the way.

I think Games, retail, and health apps are the most developed apps in the market till the date.

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App Development:
Step 1: Build the Back End of Your App.
Step 2: Design the App “Skins”.
Step 3: Test Again (Yes, Again).
Step 4: Revise and Continue to Build.
Step 5: Refine Each Detail.
Step 6 Release Time!

Augmented Reality is hot right now!

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i think all the people are prefer iOS and Android apps for mobile phone.

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In current market gaming and security based application to protect gallery and video are most popular application to develop

Today's all the people are prefer mobile apps to using various purposes like chating,communication,and other purposes ; so app development is more important and demand in this marketing world.

There are lots of categories are available to develop a mobile ; But Business ,games are most of the apps using lots of people ;

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