As a member of the Air Canada Aeroplan program, you can EARN Aeroplan miles. You can then USE these miles for free travel.
Read about how to earn and accumulate Aeroplan miles here
Read about how to use Aeroplan miles here
Read about sharing and transferring Air Canada Aeroplan Miles here
Read about Air Canada Aeroplan Miles expiration information here
Read about what happens to your Air Canada Aeroplan Miles upon death