What’s the difference between a stanza and a verse in poetry?

• Stanza:
  A stanza is a group of lines in a poem. It is similar to a "paragraph" in a story. Stanzas often share a common rhyme or theme.

For example, a stanza with four lines looks like this:

Line 1  
Line 2  
Line 3  
Line 4  

• Verse:
  A verse is just one line of poetry or part of a poem. It focuses on rhythm and the way the words flow.

For example, you have:

This is a single verse.  

In simple terms, stanzas are made up of verses. Stanzas collect several lines together, while verses are the individual lines that form those stanzas.