key dates in the history of DNA profiling

here are the key dates in the history of DNA profiling:
1953: James Watson and Francis Crick
1984:Alec Jeferrys
1986:Kary Mullis
1987:colin pitchfork and robert Melias
1989:Gary Dotson

introduction

hello my name is , S.C
i am doing a project on DNA and i  am trying to answer some questions here are some questions
:how can you see DNA?
what scientific equipment do scientists need to see DNA?
how do you find it ?
what is it?
what does it do?
is it important and why?
how does it change?
how do you get DNA?
how can you use DNA?
thanks S.C