What is the New Zealand Stock Exchange (NZX)?

Could you please elaborate on what the New Zealand Stock Exchange, also known as the NZX, is all about? I'm particularly interested in understanding its role in the financial markets, the types of securities it lists, and perhaps any unique features or regulations that distinguish it from other stock exchanges around the world. Additionally, I'd appreciate any insights into how investors can access the NZX and the potential opportunities and risks associated with investing in its listed companies.