Why is Dropbox more popular than other programs with similar functionality?

 

Answer Wiki

 

Some pretty extensive answers here, but in a nutshell:

1. It's simple.
2. It WORKS, except in China.
3. It's cheap (free).
4. It's universal (PC, Mac, Linux, mobile).
5. Effectively combines fun and function (love sharing with others).
6. The social networking angle works well.
7. A business case can also be made for this - we're using it in our work with field techs.
8. It's scalable - after people see the benefits, paying for additional storage or history has more value.
9. Great for critical files (like photos, docs, etc.)
10. Catchy name and graphic (branding/marketing)
11. The network effect (compare it with its competitors using Google trends)
12. It has a very good API for developers.