Why are side chains important?
The side chains or sidechains have great relevance because They allow to dynamize in a unique way the operation of the blockchain. Eg sidechains can enable the transfer of bitcoins and other cryptocurrencies to other blockchains. That is, thanks to the sidechain it would be possible to send BTC, to a sidechain that transforms said BTC to a certain token, and from there it goes to the Ethereum blockchain.
Likewise, sidechains can increase safety by avoiding problems that have occurred in other projects of altcoins. Also, sidechains can be used to add new unique functionalities to a blockchain without the need to alter its protocol.
Theoretically, sidechains can fix Bitcoin illiquidity, reduce volatility, increase security, reduce market fragmentation, or prevent fraud that has sometimes been observed with altcoin projects.
All of this would greatly enhance the current cryptocurrency ecosystem and open doors for new uses. In short, they are a perfect means to develop new technologies that can be adapted to those already created. All this without the need to make major changes and with the possibility of further expanding its potential.
At the same time, since sidechains remain independent blockchains, you can experience all kinds of functionalities without risk. This includes new transaction designs, trust or economic models, issuance of semantic assets, or new crypto functionalities.