Pension: a pension is a type of income stream you might receive in retirement. This 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 Superannuation Guarantee contributions that your employer must make on your behalf.
Preservation: ensures your money is kept in super until your 'Commonwealth 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 you access your super page for more information on these circumstances).