On Changelly, you can easily exchange BTC to any other crypto of those listed on the platform. However, one can say that Ethereum (ETH) is one of the major assets of the contemporary crypto market. Ethereum is based on its own blockchain technology, which is also widely implemented to launch tokens. That is why how to exchange Bitcoin for Ethereum (BTC to ETH) is one of the most demanded questions in crypto exchange segment.
Token sale is a crypto related phenomenon became trendy last few years. Token sale is often interpreted as ICO. Actually, there is no difference between the terms — both are used quite liberally in the crypto community. Token sale is the key means of raising capital for startups to help crypto enthusiasts launch their project.