Tezos smart contracts are programs that can run on the Tezos blockchain. Developers can implement any amount of entrypoints which can be called through adding a transaction to the chain.

The above chart shows the amount of transactions per day that successfully called an entrypoint of the smart contract.

Contracts can be called by any type of account on the Tezos blockchain. There are currently two main types of accounts: 'wallet' accounts and 'contract' accounts.

When a wallet account calls a smart contract, this usually comes from an interaction with a dApp interface which is then approved by the user in their Wallet app. In the case of a smart contract calling another smart contract, this usually comes from the smart contract code executing some sort of function.

The above chart shows the number of wallets calling the contract per day and the number of contracts calling the contract per day.

For more explanation on account types, see: opentezos.operations

When smart contract entrypoints are called, the smart contract code can generate new transactions targetting other wallets or smart contract entrypoints. The above chart displays these historic transactions for the top 100 accounts/entrypoints being targeted.