What is the process by which bacteria divide? How is this relevant to microbiology?

Watch the following video: https://m.youtube.com/watch?v=gEwzDydciWc
Then answer the following questions below:
What is the process by which bacteria divide? How is this relevant to microbiology?
What method would you recommend we use to count the number of bacteria cells in this video? Why?
What would you look for in order to determine if the bacteria are gram-positive or gram-negative?
Based on the shape and arrangement of this bacterium, how would you categorize it (what terms would you use to describe the bacteria)?
Let’s say that the growth you are observing is occurring under the following factors: Oxygen-rich environment; temperature range is 25-40 degrees Celsius; and uses inorganic chemical compounds as the source of energy. What terms would you use to describe the bacteria?