What's the difference between "where" clause and "on" clause when table left join?

SQL1:

select t1.f1,t2.f2 
from t1 
   left join t2 on t1.f1 = t2.f2 and t1.f2=1 and t1.f3=0 

SQL2:

select t1.f1,t2.f2 
from t1 
  left join t2 on t1.f1 = t2.f2 
where t1.f2=1 and t1.f3=0

The difference is where and on clause, is it returning same result? and what's the difference? does DBMS run them in same way? Thanks.