What is this wierd string format many plugins use?

I have seen many plugins that use a certain type of string format when they save the data in the database.

I dont know why they are not using JSON, but below is an example thats put in the wp_postmeta table in the meta_value column:


This were made by the “FiveStarPlugins Restaurant Table Reservation”.

When i book a table, they put some data as my email, phonenumber etc in there.

What kind of format is this?
Why is it not JSON?
And how do i decode it?

Thanks in advance

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