DApp, dApp, Dapp, or dapp stands for decentralized application.

Let's have a brief look at what a Daap consists of.? A decentralized app development consists of two parts. One is a front end which is usually written in HTML, and the other part is a backend.
Dapp is a blockchain-powered decentralized application that was developed by experts based on popular blockchain development. The blockchain development used is Ethereum, Hashgraph, Corda, Stellar, Tron, and cosmos.  Dapps empower both of all shapes and sizes organizations to increment deals by giving clients a speedy method for getting to and securing the organization's items and engaging the client experience by offering direct association with the organization. DApps allow companies to be more competitive in the market.

What are the qualities that you should consider in Dapp development technology?
There are several aspects that you should be considered in developing Dapps or hiring a Dapp development technology is that the client's company’s needs should be clear to the developer. The second aspect is Budget. The client should decide the amount they are willing to spend on the Dapp development agency, Dapp developer

Can we change the Dapp that is once deployed in the blockchain network like Ethereum? 
We cannot change the Dapp that is once deployed, because Dapp has a logically written contract and they are not controlled by an individual or a company but shared among all the blockchain network users.  Daaps are rampantly used as decentralized Gaming apps, decentralized Healthcare apps, decentralized banking apps, decentralized finance apps, decentralized insurance apps

The usage of Daaps is increasing rapidly. Let's look at the statistics, in 2017 the number of downloads was178.1 billion. It is expected to grow to 258.2 billion downloads by 2022.