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Pascal's triangle is a set of numbers that is popularly known for its unique pattern. It is named after the French mathematician Blaise Pascal. The triangle starts with a row containing only the number 1. Each subsequent row is constructed by adding the two numbers directly above it. Here is an example of Pascal's triangle:

         1
        1 1
       1 2 1
      1 3 3 1
     1 4 6 4 1
    1 5 10 10 5 1
   1 6 15 20 15 6 1

In this triangle, each number represents the sum of the two numbers directly above it. For example, in the fourth row, the number 3 is the sum of 1 and 2 from the previous row.

Pascal's triangle has many interesting properties and applications in mathematics, such as binomial coefficients, combinatorics, and probability. It is widely used in various fields, including algebra, calculus, and number theory.