When are investments in debt securities held to maturity purchased at a discount? How does the amortization

Question:

When are investments in debt securities held to purchased at a discount? How does the amortization of a discount under the effective interest method affect interest income?
Maturity
Maturity is the date on which the life of a transaction or financial instrument ends, after which it must either be renewed, or it will cease to exist. The term is commonly used for deposits, foreign exchange spot, and forward transactions, interest...