Who is the largest ETF provider in the world?

Can you shed some light on the question, "Who is the largest ETF provider in the world?" It's a topic that's of significant interest to investors, particularly those who are looking to diversify their portfolios through exchange-traded funds. With the rapid growth of the ETF market in recent years, it's essential to understand who the leading players are and what they offer. Are there any specific firms that stand out in terms of market share, asset size, or the variety of ETFs they offer? Additionally, how does the size and influence of the largest ETF provider impact the overall ETF industry and the investment landscape as a whole?