This is the first (& sometimes only!) opportunity to let an Admission Officer know who you are as an individual.

It's main role is to link what you are doing know and any other skills and experience you have to your chosen course.
A good personal statement will talk about the following:

• Your reasons for choosing the subject
• Any work experience you have
• Mention any future plans / career aspirations you have
• Any other qualifications / responsibilities you have (e.g. First Aid certificate, peer-mentoring, part-time work
• What interests you have outside your studies (e.g. sport, music)
  

Sound reasons for choosing the subject – this is the most important part of the statement
Show enthusiasm and enjoyment of the subject

• Refer to particular interests you have in the subject and what you would like to pursue and develop at university

Work Experience
This is particularly important for some courses (e.g. medicine, dentistry, teaching or social work)

• Make your work experiences relevant to the demands of university – e.g. time-management, working as a team and independently

Any future plans or career aspirations
In particular if the course leads to an obvious career path e.g. Medicine, Engineering

• If you not yet decided about a future career, try and refer to general areas of work or skills the course will give you for a variety of careers e.g. communications skills, time-management, team-work

Strong Conclusion
Sum up

• your strengths – what you could bring to the course
• reasons for choosing the course