192.168.10.0/24 - why /24 ? instead of 192.168.10/# notation query

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Please note the query below is about a LABEL in an ALPHANUMERIC field which
could contain anything but its the example of a notation i dont understand.

1Im looking at a hardware firewall to understand the layout of the rules.
One of the destinations shows the address "name" field as: 192.168.10.0/24

("name" field is alpha numeric and is just a label).

When i EDIT the NAME that hold the rule for the address, the actual numeric
address is displayed as: 192.168.10.0/255.255.255.0

I understand subnet 255.255.255.0 allows 256 IPs.

So what im trying to get my head around is why "name" the destination
192.168.10.0/24 as when i actaully edit the addrees its actually
192.168.10.0/255.255.255.0.

I understand this means allowing packet traffic incoming to 192.168.10.#.

But why name it "192.168.10.0/24" ?

Why not name it "192.168.10.#"

I see this with several ISPs i use, they tend to add "IP/ number". Dont
understand the /number notation means. Can someone explain ?

Thank you.


.

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