Easylivedata.com Provides Calls vacant For The Particular Stock you're looking at.

An option chain is a list of all the stock option contracts available for a given serviellance (stock).
There are only 2 types of stock option contracts, puts and calls, so an option chain is virtually a list of all the puts and calls available for the particular stock you're seeing at.
Now that wasn't so solid to get was it? Well the confusing part comes when you actually pull up a stock option chain.

All that smooth-to-grab information suddenly gets lost in translation and you're left looking at a table full of numbers and symbols that make exactly no sense at all.

Before you gain how to read an option chain, let's do a immidiate recap of the 7 step trading process thus far:

Step 1: You've used the Investor's Business Daily (IBD) to find a list of good stocks to buy.

Step 2: You've looked at the stock charts of those stocks and if you like what you see you add it to your stock watch list until you reach a list size of 50-100 stocks ().

Step 3: You've used a bit of stock trend analysis to review your stock charts on a daily or weekly basis. This process is used to find potential trades

Step 4: After you've found a potential trade, you look over the option chain and pre-select the option you're going to buy or sell.