Why ETF is less risky?

Could you elaborate on why Exchange Traded Funds (ETFs) are generally considered to be less risky investment vehicles? I'm curious to understand how their structure and operation contribute to their relative safety compared to other investment options. Could you please explain the diversification benefits that ETFs offer, as well as any other factors that contribute to their lower risk profile? I'm also interested in knowing if there are any specific types of ETFs that are generally considered safer than others. Thank you for your insights.