I am new to plsql and am trying to understand what the code below does. What does the 942 mean and why would someone want to use the code below? Thanks.

BEGIN
    EXECUTE IMMEDIATE 'DROP TABLE mostRecent
EXCEPTION
    WHEN OTHERS THEN
        IF SQLCODE != -942 THEN
            RAISE;
        END IF;
END;

Just wanting to know what it is doing. The explanations when i google for what they mean do not make sense to me with limited plsql knowledge.