You can use the word 'que' or 'qué' in many situations, for example:

You can use 'qué' when you are making a question:

¿Qué hora es?//What time is it?

You can use 'que' for compare things:

Yo soy más alto que tú. // I'm taller than you.

Yo soy menos alto que tú.// I'm shorter than you.

Yo soy tan alto como tú. // I'm as taller as you.

You can use 'que' also in the same way as you use the word 'that'.