Difference b/w inner join and outer join in DBMS?

Wiki has a good example http://en.wikipedia.org/wiki/Join_(SQL)

When you wish to get data from two related tables, you can use an inner join or an outer join to define how the data is related. For my examples, let's assume where is a table called "student" to hold student information, a table called "attendance" to hold student's attendance, and a table called StudentSchedule that holds a student's current schedule: Student has the following fields: ID FirstName LastName BirthDate Attendance has the following fields: ID AttendanceDate AttendanceCode MinutesAbsent StudentSchedule as the following fields: ID Course An inner join gets data from both tables where the specified data exists in both tables. For example, if you wanted a list of students in your database that were absent on December 4, 2003, you would use an inner join between the two examples tables "Student" and "Attendance": SELECT Student.ID, Student.FirstName, Student.LastName, Attendance.AttendanceCode, Attendance.MinutesAbsent FROM Student INNER JOIN Attendance ON Student.ID=Attendance.ID WHERE Attendance.AttendanceDate=' 12/4/2003' Th