One ETF may hold hundreds of securities while another is concentrated in one industry. Inspect holdings and weighting rather than inferring diversification from the wrapper.
ETFs & Funds
ETF
An exchange-traded fund: a pooled portfolio whose shares trade on an exchange.
Plain-English context
Put the definition to work.
An ETF can be narrow or single-stock. Daily leveraged exposure is not necessarily a multiple of the multi-day return.
Further reading and verification. Examples are hypothetical, not current quotes or recommendations. Product terms, tax treatment and market rules can change. Investor.gov — ETF bulletin
™