Meiosis is a kind of cell division that produces daughter cells that are genetically different to parent cells and contains half number of chromosomes comparing to parent cells.
At the beginning, the parent cell duplicates its chromosomes just like mitosis. The cell divides and leads to 2 genetically identical daughter cells.
This is where mitosis ends. But in meiosis, the 2 cells produced divides again, but without duplicating it's chromosomes. Therefore, this leads to 4 daughter cells at the end, each with halved number of chromosomes.
When a cell has a halved number of chromosomes, it's said to be haploid.
This is usually common in gametes so that biodiversity can be achieved.
