Explain what is the meaning of the Ramsey number r33 and arg

Explain what is the meaning of the Ramsey number r(3,3) and argue what is its value.

The Ramsey theorem R(m.n) gives the solution to the two major problems i.e. the party problem which provides the value of minimum number of gueses to attend the party so that atleast m or n will know each other in the party

2) It is also applied in the coloring, how many colors are required to graph the complete subgraph Kn and Km.