In large, multicellular organisms like ourselves, our somatic cells (body cells) are all diploid. Meiosis, therefore, takes place in specialized reproductive organs, the gonads, to produce haploid cells that will eventually fuse in pairs to produce new diploid zygotes again. Meiosis in such organisms is said to be gametic.
The haploid products produced at the end of Meiosis II go on to differentiate in quite complex ways to produce the recognizable sexual gametes; the sperm and eggs. Since each of these gametes has a very different role, and method of accomplishing that role, the two gametes are often very, very different in physical form, and the path of differentiation they take after Meiosis II.
In other organisms, such as the brewer's yeast, the haploid products produced at the end of Meiosis II are packaged and then released as independent, free living forms in their own right. This is said to be a sporic outcome of meiosis. The haploid form of a plant or fungus may live for a long time in this genetic state before recombining its biological information with that of another individual and re-entering the diploid state for a time.
Many fungi, however, only exist as diploids for a tiny, brief part of their life cycle. In these species fertilization, the fusion of two haploid cells to produce a zygote, is followed almost immediately by a meiotic division of this very same cell to produce haploids once more.
This zygotic type of meiosis is only used, therefore, to mix up and randomize the biological information contributed by two parents into the huge possible alternate forms in the various offspring. It is pure variation, which, after all, is the main purpose of meiosis and sexual reproduction.