check it out
Regarde ça is often used to attract someone's attention to something. It is an informal way of saying Look at That in French.
Look at this, it's my new dog.
In this sentence, 'Regarde ça' is used at the beginning of a statement to draw someone's attention to the speaker's new dog.
Look at this, isn't it the most beautiful sunset you have ever seen?
Here, 'Regarde ça' initiates an exclamation about the beauty of the sunset, showing the speaker's excitement and desire to share the view.
Please, look at this. I really need your opinion.
In this instance, 'Regarde ça' is part of a polite request. The speaker uses this phrase to ask the interlocutor to give his/her opinion about something.