WHERE

filter results

The WHERE clause imposes conditions on the data within a potentially matching path, filtering the result set of a MATCH.

MATCH descibes the structure, and WHERE specfies the content of a query.

Reference: WHERE manual page
Related: :help MATCH :help RETURN :help Cypher
MATCH (director:Person)-[:DIRECTED]->(movie)
WHERE director.name = "Steven Spielberg"
RETURN movie.title
Find all the many fine films directed by Steven Spielberg.