First, it's important to know your options. A funeral is a service to remember the deceased with the body present. A funeral can be open-casket, where those attending can see the deceased, or closed-casket.
A memorial is a service to remember the deceased without the body present. If the deceased is cremated and a service is held with the cremated remains present, it is a memorial.
Of course, you can choose to have neither. It's completely up to you.