Share market is a business platform where buy and sell shares. The share quotes are decided by demand and supply.

Share markets used to be market platform where a group of buyers and sellers used to gather together and express the willingness to buy/sell a share at a willing price. Whenever the two match a deal took place. Now in we can Buy share through Internet offline and online, also sell share in same procedure.
Now the share markets have become almost paperless with the Information Technology. Now you open a trading account, with a broker, transfer the requisite amount and you can start trading in share from home or office. You can use direct online terminal software where you can see share market position up and down.