Trash is a garbage item in Stardew Valley.
It can be obtained by fishing in the small pond on the player's farm, or randomly from the other rivers and lakes, along with clicking on trash cans.
Although, upon first view, this item is a complete throw-out, however, item, along with other junk items, has a purpose.
Use of Trash – & Other Junk Items[]
Trash (and other junk items) can be placed into a Recycling Machine. After some time, the trash you once put in the machine will turn into something new such as common ores, torches, and refined quartz