What is scalability and interoperability in blockchain?

[Shezcute Abbie]

  Can someone please explain in a layman's terms what interoperability and scalability is all about in blockchain? And if these two terminologies pose as a barrier to most blockchain networks in one way or another, what then are developers doing to fill in the gap?
 I believe the space is an ever evolving one so there should be blockchain projects without either of the above mentioned issues.
Can I get the opinion of everyone who understands this topic of discuss?

[un_rank]

Interoperability
You have different blockchain networks which operate independently, like Bitcoin, Ethereum, Sol etc. They operate on entirely different systems, you cannot send funds from the bitcoin network to Ethereum, you cannot draw up smart contracts that can be accepted on the different networks, most wallets cannot even hold Bitcoin and ethereum at the same time, you need designated wallets for each.

Interoperability is the ability of a blockchain to  freely share information in a streamlined manner with other independent chains. You the user will not need to bounce back and forth to enjoy the benefits of the different networks. This is possible to an extent, but it cannot make it possible to send funds from one chain to another AFAIK.

Scalability
This is the ability of a network to cope with increasing users and demand while maintaining the level of service. If you have a restaurant that regularly cooks for 100 guests a night but then get a big break and boom, the guests starts going upwards, 250, 500, 1000+, their scalability will be their ability to cope with the increasing demand without a drop in quality of service.
In the blockchain it is normally used in relation to the ability of a network to cope with increasing transactions and get them confirmed in optimal time.

- Jay -

[AvatarSiri]

  Can someone please explain in a layman's terms what interoperability and scalability is all about in blockchain? And if these two terminologies pose as a barrier to most blockchain networks in one way or another, what then are developers doing to fill in the gap?
 I believe the space is an ever evolving one so there should be blockchain projects without either of the above mentioned issues.
Can I get the opinion of everyone who understands this topic of discuss?

Unranked has explained it all, but these terms are tied to L1, L2 DeFi projects like INJ, Wormhole, CKB. You might need to read further to understand properly. https://www.bitget.com/academy/what-is-nervos-network-ckb-and-how-does-it-work

[Ambatman]

In layman's terms
Interoperability allows communication between blockchain. Inter usually mean between in a system and add operability and we get functionality between blockchain through communication.

Scalabilty well unrank has really done justice to that.
In issues arising
Let's take Bitcoin for example to improve scalabilty security would be sacrificed but layer 2 were created to improve scalabilty but the rate is lower than envisioned.
I'm aware that the interoperabilty of Cosmos token is quite high but there are some that are relatively poor and what's usually used to improve it is Cross chain bridge. Using a blockchain to serve as a bridge for communication. Bitcoin, Ethereum,BNB uses this.

[Crwth]

Basically, we all have limits. Blockchain has limits, if it reaches that, it's already the bottleneck and that could be with the following factors, transactions, block sizes, etc. It depends on what the bottleneck is and to grow, maybe grow in price like what we all want, we need it to perform in a better way and that's where scalability is talked about. How much it could go before it hits the limit and bottlenecks the function. It needs to grow.

Interoperability from what I understand is that it operates with other chains, forming bridges in order to accommodate another chain whether it's in ETH, SOL, etc. It's capable  of doing that.