A gold ETF flow is the change in physical bullion held by exchange-traded funds, created when authorised participants issue new units and deliver metal into the trust, and reversed on redemption. Because holdings are published daily in tonnes, ETF flows are the most directly observable measure of Western investment demand available to a retail gold trader.
Flows are largely trend-following: holdings typically rise after gold has already moved higher, so record-inflow headlines arrive late in a move. The productive use is weekly context — checking whether investment demand is confirming or contradicting the price trend alongside real yields and the dollar — rather than treating a daily tonnage change as an entry trigger.