Why we use collection concept in plsql programms

[srinu_a47]

hi friends,
can u plz tell why we use collections in plsql rather than records
and tell me the difference between record and collection.
plz tell me what is the main advantage of collection used in plsql programms

ok thanking in advance

[ahmadbilal]

A collection can be used as the target of a bulk bind improve the performance of data transfer between the database and the PL/SQL processing.