Hello, All chromosomes exists in pairs i.e. one from each parent. Consider the letter X as the chromosome, on arm is taken form the mother and the other form father. This will be called as haploid cell. Now consider a 3D shaped X, two arms from mother and the other two form father, this will be called Diploid cell. Haploid cells are formed due to meiosis and diploid due to mitosis. Since every cell has a nucleus and every nucleus has a chromosome , we can classify all the cells reproductive cells as haploid and the remaining cells as diploid cells. Eg for the haploid cells is gamete cells and for diploid cells is blood cells.
Hope this helps!
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