What is the difference between SDL, T-bills, and G-secs?

The difference between State Development Loans (SDL), Treasury Bills (T-bills), and Government securities (G-secs) are as follows:

Basis	Treasury-Bills (T-bills)	Government Bonds (G-secs)	State Development Loans (SDL)
Maturity	Less than 1 year (91 days, 182 days, and 364 days).	Long-dated maturities.	Long-dated maturities.
Interest	Does not carry an interest component.	Twice a year to the primary bank account linked with Zerodha.	Twice a year to the primary bank account linked with Zerodha.
Investment value	T-bills are issued at a discount to par value, and upon expiry, they are redeemed at their actual value.	Investments can be made at a discount, par value, or premium.	Investments can be made at a discount, par value, or premium.

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