IOTA

IOTA is a cryptocurrency designed with the Internet of Things (IoT) in mind. It is different from other cryptocurrencies in that it doesn't use blockchain technology but rather "The Tangle" - a directed acyclic graph (DAG).

One feature that distinguishes IOTA from other cryptocurrencies is that it promises "zero fees" for smart contract transactions. This would allow for seamless micro-transactions - something that Bitcoin can not do natively, without using "layer 2" systems like Lightning Network.

Compared to Bitcoin's 10 minute confirmation time, IOTA can potentially have thousands of transactions per second as branches of the Tangle DAG can grow in parallel as more transactions are conducted, effectively increasing transaction processing throughput in sync with DAG growth. IOTA also offers enhanced privacy features and optional quantum resistance through their quantum secure signatures algorithm.

IOTA is suitable for IoT applications because it does not require lots of computing resources for broadcasting and validating transactions. This is crucial, because IoT devices often are low power sensors that are designed to operate with limited battery power in remote locations for months or even years.

There is also no requirement to run any kind of IOTA mining nodes and expend energy for mining. This makes IOTA environmentally friendly, compared to traditional cryptocurrencies.