MetaMask is a browser plugin for computers, you probably use it to withdraw from Publish0x.

MetaMask has announced that on 22 July 2019 (in less than 7 days) it will launch its own app for mobile.

Bobby Dresser, Product Manager of MetaMask: "The Web application has more than 1.3 million users and is growing with 60 thousand active users every month, with a weekly growth of + 11%."

The purpose of MetaMask is to bring Ethereum on every browser, it allows to have its own wallet of ERC 20 Token (Ethereum, Dai, Hydro, Bounty0x, etc) and to easily access the Dapps; it is also a useful tool for developers who can connect to the main Ethereum Blockchains.

In short MetaMask is a must have and now with the mobile app (I remember it was announced for the 22nd of this month) it will be possible to have all its functions on our smartphone too