Sure, I can help you with that. Developing a smart contract involves writing code that will be executed on the Ethereum blockchain. Smart contracts are self-executing contracts with the terms of the agreement directly written into code. Here's an example of a simple smart contract written in Solidity, the programming language used for Ethereum smart contracts:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
contract SimpleSmartContract {
  // Define a state variable to store a message
  string private message;
  // Event to log the message update
  event MessageUpdated(string newMessage);
  // Constructor to initialize the contract with a default message
  constructor() {
    message = "Hello, world!";
  }
  // Function to get the current message
  function getMessage() public view returns (string memory) {
    return message;
  }
  // Function to update the message
  function setMessage(string memory newMessage) public {
    message = newMessage;
    emit MessageUpdated(newMessage);
  }
}

Explanation of the smart contract code:

1. pragma solidity ^0.8.0;: This line specifies the version of Solidity the contract is written in.

2. contract SimpleSmartContract { ... }: This defines the main structure of the contract.

3. string private message;: This line declares a private state variable `message` of type string to store our message.

4. event MessageUpdated(string newMessage);: This declares an event `MessageUpdated` that will be emitted when the message is updated.

5. constructor(): This is the constructor function that initializes the contract with a default message.

6. function getMessage() public view returns (string memory): This is a public view function to retrieve the current message without modifying the state of the contract.

7. function setMessage(string memory newMessage) public: This is a public function to update the message. It emits the `MessageUpdated` event when called.

8. message = newMessage;: This line updates the `message` variable with the new message passed to the `setMessage` function.

To deploy and interact with this smart contract, you would typically use tools like Remix IDE, Truffle, or Hardhat along with a test network or the Ethereum mainnet. Let me know if you need further assistance with deploying or interacting with the contract!