"Mining in terms of blockchain is the process of adding the new bitcoins in circulation by solving the complex mathematical problems with the help of computing power "
HOW DOES MINING WORKS?
In order to secure and to process each transaction miners use computer power after the successful verification of transactions a new block is formed which is then added to the chain network of blockchain and to run the system miners are rewarded with newly formed bitcoins and with a network fee.
At present for every new block formation, there is a reward of 6.25 bitcoins which Cutts half after every four years. At the time of when bitcoin invented this reward was 50 bitcoins and this process is called halving.
But doesn't it lessen the profitability of miners? yes, it indeed affects the miners so to keep the mining feasible every new year new hardware is introduced in the market which has an increasing Hash rate while keeping the electricity consumption low. if you want to make more profits you should rather go to the country where the electricity is much cheaper. 
LEADING MINER PLAYER IN THE INDUSTRY.
As mining is getting evolved new mining computers are coming into the industry days are gone when you can mine bitcoins with your personal computer as difficulty level to solve the problems is increasing so we need advanced and efficient computers to keep the mining feasible. Bitmain the leading Miners making industry just introduced the new miner ANTMINER S19 AND S19 PRO both have incredible performance.
The Antminer S19 and S19 Pro arrive in two variants. The Antminer S19 is provided with a hash rate of 95 TH/s, while its opposite variant holds a hash rate of 90 TH/s, both variations have a power efficiency of 34.5±%5 J/TH
As for the Pro version, hash rates and power efficiency are more improved. The Antminer S19 Pro highlights a hash rate of 110 TH/s, while its other variant has a hash rate of 105 TH/s, both variations have an impressive power efficiency of 29.5±%5 J/TH
Mining is an essential part of bitcoin which keeps the network safe, secure, and stable.