The chart on the left is the 3 month interest rate swap.
Interest rate swaps are a common type of derivative security, which simply means that their value is “derived” from underlying assets (in this case, loans and interest rates). In a swap, two parties agree to exchange two streams of cash flow; in an interest rate swap, these cash flows are the interest payments for some given amount of money. The underlying money, known in this context as the notional amount, doesn't necessarily change hands. The two parties just exchange the interest payments they would make if they had actually borrowed the notional amount.
There are three main types of interest rate swaps, as determined by the type of rates being swapped:
Interest rate swaps are traded over the counter (OTC), most commonly on fixed income desks at investment banks. Because they are not traded on open exchanges, interest rate swaps are not regulated by any government agency, so parties have a great deal of flexibility when setting the terms of the swap. Globally, the total notional amount of interest rate swaps outstanding was $309.6 trillion USD as of December 2007, accounting for 52% of the total OTC market.