What is a Layer 2(or Layer X)?

A function label, with preset criteria and attributed purpose or task for the environment or system it pertains to.

Rollups, validiums, etc., are just objects intended to fit this function label.

https://x.com/thepizzaknight_/status/1747374061951287645?s=46&t=GxyN7qBovxAqEoJW-dTZ8Q

L stands for ‘Layer’.

The sequence of numbers determines which one precedes the other and which one is dependent on the other. Eg. L2 runs on L1.

Each layer is typically a blockchain.

https://warpcast.com/emmanuel/0x96ec5b

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BTC is L1 lighting is L2.. ETH is L1 Base ETH is L2..