Google Ads scripts provide a way to programmatically control your Google Ads data using simple JavaScript in a browser-based IDE. You can use scripts to automate common procedures or interact with external data—for one to many Google Ads accounts.

[Source: Google]

https://developers.google.com/google-ads/scripts

These scripts can help you save a lot of time by automating tasks performed at your adwords account. it can also interact with third party APIs and Databases and do pre-defined logical operations to optimize your ad account accordingly.

Here are some examples:

• It can start/stop a campaign when the daily budget limit reaches a certain amount.
• It can increase/decrease the CPC when certain criterias are met. 
• It can read a google sheet to update the daily budget for the campaigns on regular basis.
• Ad scripts are capable of performing advanced logical operations defined by you and optimize your adwords account based on your instructions.

if you have something in your mind or have some doubt, please feel free to inbox me.

Thank you !