> For the complete documentation index, see [llms.txt](https://docs.sputnik.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sputnik.network/sputnik-app/brief-about-sputnik-app.md).

# Brief about Sputnik App

* [**Sputnik App**](/glossary-of-terms-and-scheme/sputnik-app.md) is an application that allows users to send and receive any tokens from Cosmos Ecosystem projects not only by blockchain-address, but also by Telegram, Twitter, Discord usernames and/or email 
* [**Sputnik App**](/glossary-of-terms-and-scheme/sputnik-app.md) allows users to send tokens by a list, which consists of usernames, emails and/or blockchain-addresses 
* [**Sputnik App**](/glossary-of-terms-and-scheme/sputnik-app.md) allows users to send NFTs individually or by the list, which consists of usernames, emails and/or blockchain-addresses 

[**Sputnik App**](/glossary-of-terms-and-scheme/sputnik-app.md) consists of two parts: [**Web2 (centralized)**](/sputnik-app/web2-functionality.md) and [**Web3 (decentralized)**](/sputnik-app/web3-functionality.md) 

* [**Web2**](/sputnik-app/web2-functionality.md) and [**Web3**](/sputnik-app/web3-functionality.md) parts are completely independent of each other, but if the [**User**](/glossary-of-terms-and-scheme/user.md) wishes, they can interact with each other 
* The [**Web2**](/sputnik-app/web2-functionality.md) part is centralized, partially based on [**Akash**](https://akash.network/) (a decentralized server), stores private keys of the [**App Address**](/glossary-of-terms-and-scheme/app-address.md) and [**Internal Addresses**](/glossary-of-terms-and-scheme/internal-address.md) of users in encrypted form, and can sign transactions from the [**App Address**](/glossary-of-terms-and-scheme/app-address.md) and [**Internal Addresses**](/glossary-of-terms-and-scheme/internal-address.md) of users
* The [**Web3**](/sputnik-app/web3-functionality.md) part is decentralized, based on the [**Sputnik Network App-chain**](/glossary-of-terms-and-scheme/sputnik-network-app-chain.md), and essentially represents a user interface for easy access to the functionality of the [**Sputnik Network App-chain**](/glossary-of-terms-and-scheme/sputnik-network-app-chain.md), as well as for the interaction of the [**Sputnik App**](/sputnik-app.md) with various blockchains, tools and dApps from the [**Cosmos Ecosystem**](/glossary-of-terms-and-scheme/cosmos-ecosystem.md)