We use the Past Continuous to talk about actions at a specific time in the past.
We can use several connectors, such as:
At: to talk about an action that was in progress at a specific time.
When: to talk about interrupted actions.
While: to talk about simultaneous actions.
Check the presentation below to learn more about this tense.
Yesterday, I was searching for information while I was repairing my computer. - Example of simultaneous actions.