Includes the financial securities that represent an ownership interest in a pool of mortgage loans.

The text you provided refers to Mortgage-Backed Securities (MBS). Here's a step-by-step explanation:

1. Homeowners borrow money from a bank or other financial institution to buy a house. They agree to pay back the loan, with interest, over a certain period of time. This is called a mortgage loan.

2. The bank or financial institution that issued the mortgage loan sells it to a government agency or investment firm. This process is known as securitization.

3. The agency or firm that bought the mortgage loan combines it with other similar loans. This pool of loans is then divided into shares or "securities".

4. These securities are sold to investors on the open market. Each security represents an ownership interest in the pool of mortgage loans.

5. Investors who buy these securities receive regular payments from the homeowners' mortgage payments. This includes both the principal and the interest.

6. If a homeowner defaults on their mortgage, the investors may lose money. However, the risk is spread out among many investors because each security represents only a small portion of the total pool of loans.

In summary, Mortgage-Backed Securities are financial securities that represent an ownership interest in a pool of mortgage loans.