Ethereum is a smart contract platform that enables developers to build tokens and decentralized applications (dapps). ETH is the native currency for the Ethereum platform and also works as the transaction fees to miners on the Ethereum network. Ethereum is the pioneer for blockchain based smart contracts. Smart contract is essentially a computer code that runs exactly as programmed without any possibility of downtime, censorship, fraud or third-party interference. It can facilitate the exchange of money, content, property, shares, or anything of value. When running on the blockchain a smart contract becomes like a self-operating computer program that automatically executes when specific conditions are met. Ethereum allows programmers to run complete-turing smart contracts that is capable of any customizations. Rather than giving a set of limited operations, Ethereum allows developers to have complete control over customization of their smart contract, giving developers the power to build unique and innovative applications. Ethereum being the first blockchain based smart contract platform, they have gained much popularity, resulting in new competitors fighting for market share. The competitors includes: Ethereum Classic which is the oldchain of Ethereum, Qtum, EOS, Neo, Icon, Tron and Cardano. Ethereum wallets are fairly simple to set up with multiple popular choices such as myetherwallet, metamask, and Trezor. Read here for more guide on using ethereum wallet: How to Use an Ethereum Wallet
AERGO is an open platform that allows businesses to build innovative applications and services by sharing data on a trustless and distributed IT ecosystem. With the ability to deploy on either public or private blockchain networks, AERGO gives businesses the flexibility in developing and deploying blockchain applications with unparalleled speed, scalability and performance. AERGO is designed as a flexible, plugin-based smart contract infrastructure. Client-actors can execute smart contracts written for the Ethereum Virtual Machine or AergoSQL. The AERGO network will be backboned by github-like public and permissioned repositories of Distributed Directories (DD). Implementing Smart Oracles, AERGO will also allow smart contracts to consume data with external services or internal databases and trigger events.