From Desynced Wiki

A resource is an item that is considered a "raw material" and additionally can be collected with the use of Miners, Laser Extractors and Blight Extractors. Bug Chitin is dropped from bugs so does not require specialist equipment to acquire.

Resources are base level items that essential for producing Materials.

Mined Resources
Harvested Resources
Dropped Resources

For a list of resources see: Category:Resources'