Slime mold or mould is a broad term describing protist

Protist

Protists are a diverse group of eukaryotic microorganisms. Historically, protists were treated as the kingdom Protista, which includes mostly unicellular organisms that do not fit into the other kingdoms, but this group is contested in modern taxonomy...

s that use spores to reproduce. Slime molds were formerly classified as fungi, but are no longer considered part of this kingdom.

Their common name refers to part of some of these organisms' life cycles where they can appear as gelatinous "slime". This is mostly seen with the myxomycetes, which are the only macroscopic slime molds.

Slime molds have been found all over the world and feed on microorganisms that live in any type of dead plant material.