IBC stands for Inter-Blockchain Communication Protocol, which allows different blockchains to communicate between them (via relayer) and transfer assets
An airdrop is a campaign that usually requires several social media steps like: Telegram group or channel follow Twitter actions such as like and retweet plus tag friends submit a form with some data. etc. In exchange, your address is added to a list that later is validated to check if all the requirements are satisfied to receive some free tokens. Some airdrops have as prerequisites being owner of another cryptocurrency or to perform additional steps like community activity in the chats, etc....
Altcoin makes references to Alternative Coins, and refers to other cryptocurrencies that appeared under the umbrella of the successful Bitcoin trying to overcome some of the problems it has.
Binance is an exchange for quickly trading and converting between crypto currencies. Binance allows adding funds via wire transfer, credit card, etc and transfer the assets to other exchanges or wallets.
A block explorer is a web tool that allows to browse the blockchain, it’s useful to examine a transaction performed or the contracts we’re interacting to. A link to a specific transaction can be provided to another user for verification purposes as it shows the amount, sender and recipient wallets. Each chain or network has its own block explorer.