This essay is written to introduce Russell's theory of definite description. The main content of this essay includes: the definition of definite description, puzzles regarding definite description, Russell's theory of definite description, how this theory solves puzzles, Strawson's objection to this theory, my assessment of convincingness of Strawson's objection and my assessment of the convincingness of Russell's theory of definite description. What is a definite description? A definite description is a phrase commonly written in the form "so-and-so" where "so-and-so" is a singular noun. An example of a definite description is “the President of Russia”. In addition to “so and so,” definite descriptions can also take the form of possessives such as “Mr. Smith's daughter.” What puzzles does Russell say his theory can solve? At first it is easy for us to see the defined description as a singular term tool. In other words, we can believe that the role of the definite description is to refer to a particular object. Let's take the following statement as an example of this belief: “the current president of Russia was bald”. In this statement, we can see that “the current president of Russia” refers to Putin and the truth value of this statement depends on how things happen to the real man: Putin. However, Russell believes that if we do this, there will be logical puzzles like the ones listed below. The first puzzle stated by Russell is the puzzle of Informational Identity. We will examine the following example: “Clive is the author of Narnia, where “Clive” is a name and “the author of Narnia” is a definite description, and this statement is true. According to the singular term concept and our assumption, “……middle of paper……es is the only real “competitor” of Russell's theory and it is reasonable for Russell to mention this view only in his argument. Furthermore, as mentioned before, in my opinion, Strawson's objection is not convincing enough to reduce the strength of Russell's theory of definite description. Conclusion Russell's theory of definite description totally changed the way we see definite descriptions by resolving the three logical paradoxes. It is undeniable that the theory itself is not yet perfect and there may be objections to this theory. However, so far, Russell's theory is the most logical explanation of the role of definite description. Works Cited B.Russell. "Descriptions of Chapter XVI". B. Russell. Introduction to mathematical philosophy. London: Routledge, 1993.—. "On denotation." Mind (1905).PFStrawson. "On the reference." Mind (1950). Lee, Barry 2013: R&A Lessons