STORED PROCEDURE
A stored procedure is an already written SQL statement that
is saved in the database. We can run  the stored procedure
from the database's command environment 

1.Precompiled execution. SQL Server compiles each stored
procedure once and then reutilizes the execution plan. This
results in tremendous performance boosts when stored
procedures are called repeatedly. 
2.Reduced client/server traffic. If network bandwidth is a
concern in your environment, you'll be happy to learn that
stored procedures can reduce long SQL queries to a single
line that is transmitted over the wire. 
3.Efficient reuse of code and programming abstraction.
Stored procedures can be used by multiple users and client
programs. If you utilize them in a planned manner, you'll
find the development cycle takes less time. 
4.Enhanced security controls. You can grant users permission
to execute a stored procedure independently of underlying
table permissions. 


TRIGGER

 A trigger is an object contained within an SQL Server
database that is used to execute a batch of SQL code
whenever a specific event occurs. As the name suggests, a
trigger is “fired” whenever an INSERT, UPDATE, or DELETE SQL
command is executed against a specific table.