[anilmr]

A DApp, or Decentralized Application, is a software program that allows users to interact with a network like the Ethereum network. Even though DApps don’t have to have anything to do with cryptocurrency, cryptocurrency is still needed to run the system. Even after, literally breaking my head, I haven't been able to crack its code, i.e. how it functions, its pros and cons from investment point of view, how secure it is, etc. Can anyone here shed some more light on it, especially from the point of view of investing in this technology for some pecuniary benefits?

[ptrikha21]

It could mean that such an App which works on a cluster - or multiple servers, which each server owning part of the data - and collectively they run.
They could have some failover systems plus redundancy for emergency purpose.
Yet even I need to know more about this term.

[mrki444]

A DApp, or Decentralized Application, is a software program that allows users to interact with a network like the Ethereum network.

What do you mean under inteaction? What type of interaction is possible? Can you give some example?