Give the structural differences between saturated and unsaturated hydrocarbons with two examples each.

(N/A) Saturated hydrocarbons contain only carbon-carbon single bonds $(C-C)$.
Unsaturated hydrocarbons contain at least one carbon-carbon double $(C=C)$ or triple $(C\equiv C)$ bond.
Examples of Saturated hydrocarbons:
$1$. Methane $(CH_4)$: $H-C(H)(H)-H$
$2$. Ethane $(C_2H_6)$: $H_3C-CH_3$
Examples of Unsaturated hydrocarbons:
$1$. Ethene $(C_2H_4)$: $H_2C=CH_2$
$2$. Ethyne $(C_2H_2)$: $HC\equiv CH$