The phrase "various altcoins" refers to different alternative cryptocurrencies other than Bitcoin. It implies that there are multiple digital currencies developed independently with their own unique features and technologies. Full definition
The service will also offer coin investment guides with analyses of various altcoins. (dailybitcoinnews.com)
You can also use both the above given methods to convert various altcoins among each other. (coinscage.com)
ShapeShift has been very helpful with that, and Exodus was the first desktop software wallet to integrate ShapeShift to help users do conversion between various altcoins. (cryptomorrow.com)