neo4j - what does mean Open Transaction and Commit Transaction -

i'm working on neo4j . faced 2 window : open transaction , commit transaction .

what mean open transaction , commit transaction ?

picture of neo4j:

the neo4j browser used transactional cypher http endpoint execute cypher query.

the browser first opened transaction (in "open transaction" phase) making request endpoint without passing cypher statement.

it committed transaction (in "commit transaction" phase) making second request endpoint (with appropriate numeric transaction id), passing cypher statement.