It is a realistic novel: he wants to prove the truth of reality so the description are very detailed.
As a matter of fact the author feels the need of giving everything the right features such as colors, length, width and also many coordinated about place and time. Moreover in order to satisfy the idea of verisimilitude the narration is completely in first person.
It is divided into three sections:
1) The main character is introduced: Robinson Crusoe is a business man, belonging to the middle class. Despite his father's warnings about all the dangers, he decides to leave his family and goes travelling to make a fortune, which finds when he lands in Brazil where he becomes a successful planter.
However, during an expedition to Africa to buy slaves for his plantation, he is shipwrecked on a desert island.
2) The second sections rotates around the Robinson's life on the desert island, where he stays for 28 years, during which he keeps a diary, until he is saved by an english ship. After some years he realizes that he isn't completely alone and on Friday he saves a cannibal from a group of indigens. So for gratitude, the cannibal becames his slave and Robinson gives him a name, Friday, like the day he was saved.
Robinson Crusoe is a pragmatic hero: when he first lands on the island there is very little despair, because he immediately reacts, he never gives up; he arranges everything, building his small empire on the island, re-creating the world he has left behind him. At first he builds a raft because he realizes that some food is on the wrecked ship so he tries to recover them, then he builds a refuge and he even arranges his leisure time.
What helps him to never give up is the Bible, which he reads everyday to gain the right energy to go home.
The way he approaches reality is if it's useful to him or not: it's an economic point of view. As a matter of fact he became the symbol of European of colonizers. He establishes with Friday a master-servant relationship. He never tries to learn Friday's language and never asks him if he has a name, because he is only interested in Friday's usefulness. He wants to dominate everything and he imposes to Friday his language, customs, religions, food, clothes.
Robinson Crusoe is a flat character, because he never undergoes a transformation, his attitude towards reality is always the same.