What Is The Difference Between Signifier And Signified?

What Is The Difference Between Signifier And Signified? The signifier is what you call something (the word “tree” for tree), whereas the signified is the concept of the thing itself, and all other related concepts: all iterations of “tree,” plus “bush” and “shrub” and anything else tree-like. What is signifier and signified according to Saussure?