Minecraft wiki entry for Item_(entity), associated text: The death of a mob or player.
A block that is mined by a player, destroyed by an explosion, or washed away by water.
An inventory item tossed by pressing the drop item key (default Q on PC, on Xbox, / on Nintendo Switch, on PlayStation) or dragging a stack outside of an inventory window.
In the mobile versions of Bedrock Edition, items in the hotbar can be dropped by pressing on the item's slot. The entire stack is dropped.
A container (other than an ender chest or a shulker box) that is destroyed while holding items inside.