When is DNA copied?
In human, mitosis produces diploid daughter cells which have the same number of chromosomes as the parent cell.
Meiosis produces gametes (sperm or egg) which are haploid, meaning these cells have half the number of chromosomes as body cells such as skin cells.
DNA is copies using a process called semiconservative replication. Here is a video to help explain how the copying happens.
Hope this helps!