Original sentence: A varchar'' or Variable Character Field is a set of  character data of indeterminate length.The limit differs from types of databases, an  Oracle 9i Database has a limit of 4000 bytes and  Microsoft SQL Server 2005 8000 bytes.This is mostly because, unlike the fixed-size  char data-type, varchar''' does not store any blank characters, reducing the size of a database when the full length of the field is not used
Edited sentence: A Variable Character Field (or varchar) is a set of  character data of indeterminate length.Making the database faster and cost efficient.The limit differs from types of databases, an  Oracle 9i Database for instance the maximum field length is 4000 bytes while  Microsoft SQL Server 2005 has a maximum of 8000 bytes.This is mostly because, unlike the  char data-type, varchar does not store any blank characters, reducing the size a database increases when not the full length of the field is used