Ether is the second most popular cryptocurrency. Ethereum transaction is way quicker, it can do its process within a few seconds. It uses Et-Hash. 

Ether had performed exceptionally well in recent years. Ether began from nowhere in 2015 and is now valued at around $2k. 

The smart contract feature has made it work efficiently. Although there is one disadvantage of Ether, and that is the GAS fee required for the complex tasks to be solved, making it even more expensive for developers. 

Unlike Bitcoin, Ether doesn't have a limited amount. Whereas the supply for Bitcoin is restricted to twenty-one million.

 

Ethereum Market Cap History (2015-2021)

2015

January: 10 million USD

December: 70 million USD

Highest: 70 million USD in December 2015
Lowest: 10 million USD in January 2015

2016

January: 180 million USD
December: 700 million USD

Highest: 1.13 billion USD in May 2016
Lowest: 180 million USD in January 2016

2017

January: 950 million USD
December: 73 billion USD

Highest: 73 billion USD in December 2017

Lowest: 950 million USD in January 2017

2018

January: 108 billion USD
December: 13.9 billion USD

Highest:  108 billion USD in January 2018

Lowest: 11.7 billion USD in November 2018

2019

January: 11.2 billion USD 
December: 14.1 billion USD

Highest: 31 billion USD in June 2019
Lowest: 11.2 billion USD in January 2019

2020 (The Pandemic Year)

January: 19.7 billion USD
December: 84 billion USD

Highest: 84 billion USD in December 2020

Lowest: 19.7 billion USD in January 2020

2021

January: 150.5 billion USD
Right now: 403 billion USD (As of October) 

Highest: Still counting
Lowest: Still counting

Conclusion:

The market capitalization of Ethereum (Ether) has been quite volatile. It has risen from around 0.9 billion USD straight to 73 billion USD and from 108 billion to 14 billion, which is roughly 10 times less than the former.

We are now well understood a fact that the lowest or the highest market cap of a year is usually noticed either at the start of a year or at the end of a year. 

Ether saw an important increase in its price during 2017. There was a ceaseless increase in price from $308 to $1066 between October 2017 and January 2018. 

The price of an Ether sojourned below 1066 till the start of 2021, the year when Ether got a swift rise in its value. 

Like Bitcoin, the price of Ether rose perpendicularly from October 2020 to January 2021. This time, the price grew from $380 to $1385.