The DAPP Network is run by 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 - trust-less caching layer for EOSIO RAM, reduces total RAM needed for running DAPPs
LiquidHarmony - suite of oracle request formats and examples (price feeds, random numbers, etc)
LiquidScheduler - on-chain one-time or re-occuring cron service (fetching a price)
LiquidAccounts - EOSIO accounts stored in vRAM versus RAM
LiquidStorage - IPFS storage service (images, videos, etc)
LiquidLink - arbitrary EOSIO / ETH (EVM) multi signature signing service
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: