Many people have already reviewed this book here at Amazon's website, and a detailed summary of the content is available. So, I am not going to add just another review, but want to put a focus on the ending of the book.
The first two parts, Gulliver's travels to Liliput and Brobdingnag are the famous ones - and at the same time the ones, which most reviewers concentrated on. I did not consider these as the best parts of the book. As a satire is is not sharp enough, as an adventure story there is not enough tense in it, as a philosophical reflection it is not elaborate enough. All this changes towards the end of the book, in the fourth section. It is a story of self-alienation in an intercultural encounter, when Gulliver admires the logic and manner of the horses and detests the low spirit of the yahoos, which is just a synonym for mankind. Living in a distant culture for three years makes him take on the manners and peculiarities of the horses. This in turn causes a lot of difficulties when he gets home to England. This part of the book is very up-to-date in a globalized world, where the number of expatriates and re-patriates is ever-increasing. The first three parts may be just another nice reading, but the fourth really makes this book a valuable pearl, which can cause reflections about the human situation in the beginning of the 21st century.