Ethereum was first disclosed in 2015, the development roadmap of Ethereum is categorized in four different phases. Each phase within the development cycle of the Ethereum network is defined with an aid of Ethereum Improvement Protocols (EIPs)

These protocols were introduced and endorsed by an Ethereum community. The proposals engineered a set of guidelines for the numerous Ethereum clients and developers.
For instance, the current version of Ethereum is regarded as Constantinople and was created totally with an aid of four EIPs whose job is to ensure the security, scalability, and privacy of the whole network.

Crypto exchanges Region
Coinmama Africa, Asia, Australia, Europe,
South America, United Kingdom
and United States
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Wazirx Global, United States excluded Go there
Changelly Global, including United States Go there
Coinbase Australia, Europe, United Kingdom
and United States
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Binance Global, United States excluded Go there

Back in 2015, the first version of an Ethereum network was released and is known as Frontier.

Frontier allows the users and developers at the Ethereum network to mine ether, build Decentralized applications, and get their hands dirty with plenty of extremely useful tools at this platform.

In 2016, the second stage of Ethereum’s development was publicized as Homestead. It significantly reduces the shortcomings in an Ethereum network and paves the way for scalability.

The third and recent stage of Ethereum development is referred to as Metropolis. For the sake of simplicity, Metropolis can be easily categorized into two releases namely Byzantium and Constantinople.

Byzantium was first publicized in October 2017, and it is comparatively lighter, faster, and secure than all the previous versions. Byzantium allows all the developers of an Ethereum network to perform on-chain verification of zk-SNARKS therefore, the privacy of the network increases.

Even though the acronym zk-SNARKS sounds a bit confusing, the system is reliant on the relatively simple concept called zero-knowledge proof. This is an effective method that plays a decisive role in proving the authenticity of a statement without disclosing anything apart from whether the statement is true or not.

The real-life analogy of this method could be, I want to prove to my friend that I know the password of his cell phone, but I don’t need to reveal the password.
Byzantium also transforms the traditional mining methodology – the most prominent mining methodology in almost all the cryptocurrencies and an Ethereum is no exception. This up-gradation will make the mining more complex in an anticipation of transition from the resource-intensive Proof-of-work to a Proof-of-stake.

Constantinople, another great version of the Ethereum network, expected to release in November 2018 was built by taking these improvements as a reference. Ethereum developers postponed the official release of it until 2019. The hard fork finally happened on February 28, 2019, with 7,280,000 blocks.

The Constantinople version was considered as a “maintenance and optimization upgrade” which had no big changes to the average user.

Read everything you need to know about the Ethereum 2.0 upgrade