What is a stock exchange-traded fund (ETF)?
Could you elaborate on what a stock exchange-traded fund (ETF) is? As a financial professional, I'm curious to understand its workings and features in more detail. Specifically, I'd like to know how ETFs differ from traditional mutual funds, what types of assets they typically hold, and how investors can gain access to them. Additionally, I'm interested in understanding the advantages and potential risks associated with investing in ETFs. Could you provide a concise yet comprehensive description of ETFs, outlining their main characteristics and how they function in the market?