What is in 2nd and 3rd generation coins?

Second-generation coins typically include features such as smart contracts and improved scalability, enhancing functionality beyond simple transactions. Examples include Ethereum, which introduced programmable blockchain applications. Third-generation coins focus on solving issues like interoperability and sustainability, aiming for greater efficiency and user adoption; examples include Cardano and Polkadot. These advancements address limitations of their predecessors while promoting broader blockchain adoption and usability.