The Complete Solidity Course - Zero to Advanced for Blockchain and Smart Contracts - What are Abstract Contracts in Soli

The video tutorial explains abstract contracts, which contain at least one function without implementation, and their use as base contracts in inheritance. It contrasts regular and abstract contracts, demonstrating how to convert a regular contract into an abstract one by marking functions as virtual and the contract as abstract. The tutorial also covers the challenges of deploying abstract contracts and how derived contracts can override functions from base contracts.

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