In Tally 9 ERP, in accounting features (F11), what is the meaning of "integrate accounts and inventory"?

if we turn on the integrate accounts with inventory thestock/inventorybalance figures are automatically updated from the inventory records. You may also drill down to Stock Register from theBalance Sheet.

This option has a significant effect on the Balance Sheet and Profit & Loss Account. If set to Yes, it extracts the stock/inventory balance figures from the inventory records and provides a drill down to the Stock registers from the Balance Sheet.

If set to No, it ignores the inventory books figures and picks up manually entered closing stock balances from the ledger account created. This facilitates the maintaining of  accounts and inventory separately.