How do you write a compare and contrast essay?

Compare and contrast ... is a popular formula with some teachers. Essentially, it asks for a comparison but is formulated in such a way as to remind one that one should compare differences as well as similarities.
To compare means to give all of the similarities between two things.

To contrast means to give all of the differences between those things.

Make a list of all the facts you have learned about each of your two topics.

Now, merge the facts into sentences - look for ways that the two things are alike first, and write sentences that describe each similarity. Then look for ways that they are different and write sentences that describe the ways they differ. Organize your sentences so that they flow well from topic to topic, and include short explanatory additions where that would help someone understand a point you are making.

Write a good summary sentence in which you state whether the two items are more alike or more different, and you've got a great compare and contrast report.

To make is award winning, you have to make is very good in terms of organization, explanation, sentence structure and use of grammar, and make is better than any other entry in the competition.