How is structure of Alkynes are different from that of Alkenes?

Chemical formula of Alkene$\left({\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}}\right)$ is different from chemical formula os Alkyne $\left({\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}-2}\right)$.

The structure of Alkenes and Alkanes are different and which can see the difference by the following structures.

Alkene :

Alkenes have Double bond in their structure.

Alkyne :

Alkynes have triple bond in their structure.