Interphase is the beginning of the process. In interphase the cell grows and copies its chromosomes in order to prepare for cell division. There are different stages in interphase. In the G1 phase the cell grows. In the S phase the cell continues to grow as it copies its chromosomes the chromosomes are replicated in this sub-phase. In G2 it continues to grow to prepare for cell division. In the M phase the cell divides. This process is repetitive. In this video it shows the chromosomes just being there (out of order and just there) and then it showas that the chromosomes are replicated.
This shows prophase. The chromosomes are more structure than before. The chromatin fibers are put together and the nuclear envelope begins to disappear. When this happens the DNA shortens and thickens and the centrioles move to the poles. The duplicated chromosomes are shown. In Prometaphase the nuclear envelope in disappearing. and the chromosomes begin to move toward the middle of the cell.
Metaphase is a long process which lasts about 20 mins. In this phase the chromosomes line up at the center so they can prepare for separation in the next phase (anaphase). The two sister chromatids are pulled apart during anaphase (short phase), The spindle fibers are what pulls the chromatids apart. The spindle fibers is what pulls the sister chromatids away from each other.
In the last phase, telophase, two daughter nuclei begins to form. the nuclear envelopes reappear. There are now two new daughter cells!