# Introduction

## Introduction to the DAPP Network

The DAPP Network is run by DAPP Service Providers ([DSPs](https://docs.liquidapps.io/liquidapps-documentation/dapp-service-providers/dsps)), specialized nodes running on top of the blockchain, using IPFS for data storage. Developers and other users may stake the DAPP token for a customizable amount of time to DSPs in exchange for services.

Core Services include:

* [vRAM](https://docs.liquidapps.io/liquidapps-documentation/dapp-network-services/dapp-network-services/vram) - trust-less caching layer for EOSIO RAM, reduces total RAM needed for running DAPPs
* [LiquidHarmony](https://docs.liquidapps.io/liquidapps-documentation/dapp-network-services/dapp-network-services/liquidharmony) - suite of oracle request formats and examples (price feeds, random numbers, etc)
* [LiquidScheduler](https://docs.liquidapps.io/liquidapps-documentation/dapp-network-services/dapp-network-services/liquidscheduler) - on-chain one-time or re-occuring cron service (fetching a price)
* [LiquidAccounts](https://docs.liquidapps.io/liquidapps-documentation/dapp-network-services/dapp-network-services/liquidaccounts) - EOSIO accounts stored in vRAM versus RAM
* [LiquidStorage](https://docs.liquidapps.io/liquidapps-documentation/dapp-network-services/dapp-network-services/liquidstorage) - IPFS storage service (images, videos, etc)
* [LiquidLink](https://docs.liquidapps.io/liquidapps-documentation/dapp-network-services/dapp-network-services/liquidlink) - arbitrary EOSIO / ETH (EVM) multi signature signing service
* [LiquidAuth](https://docs.liquidapps.io/liquidapps-documentation/dapp-network-services/dapp-network-services/liquidlink-1) - Authentication of offchain APIs and services using EOSIO permissions and contracts

Services may also be combined for features such as an EOSIO <> ETH token/nft bridge which uses vRAM to store transfer information, LiquidHarmony for fetching new transfers and performing finality checks, LiquidLink (signing ETH trxs), and LiquidScheduler to run the previous 3 services on a repeated interval.

See more examples here:

{% content-ref url="introduction/examples" %}
[examples](https://docs.liquidapps.io/liquidapps-documentation/introduction/examples)
{% endcontent-ref %}

## Zeus SDK

Zeus is an AntelopIO smart contract developer kit which can be used for creating, testing, migrating smart contracts and much more, check it out.

{% content-ref url="working-with-zeus-sdk/overview" %}
[overview](https://docs.liquidapps.io/liquidapps-documentation/working-with-zeus-sdk/overview)
{% endcontent-ref %}