What are the three main types of plastic and what are they used for?

I had this exact question on my chemistry test PETE used in water bottles 
HDPE used in expensive water bottles
LDPE use in cheap waterbottles

i put this on my test and get it all right 

1. Plastic surgery (Used mostly by both genders to fill in the missing spots they have on/in their body or increase the size or decrease depending on whatever you want the doctor to do for you)

2. Plastic water bottles (Normal containers that we should recycle more and also are used to hold/store our water in to hold it for use while we drink, like a mobile water fountain)

3. Plastic Trumpet (Used to show younger children how to play the real instrument, like a preview of it).

Engineers have contribute to society in many ways like making the technology we use today or any type of power energy material

They make up examples of physical properties