Pension: A pension is a type of income stream you might receive in retirement. To receive it may involve putting your super into a product such as an Allocated Pension, where you would receive a regular income drawn from your super.
Personal contributions: These are contributions that you can make that are over and above the compulsory Super Guarantee contributions that your employer must make on behalf.
Preservation: Ensures your money is kept in super until your 'preservation age' which is a requirement by legislation. Until this age, you will be unable to access your super benefit (other than in certain defined circumstances - go to the when can I access super page for more information on these circumstances).