Wondering why is that for... no clue.
Can somebody explain?
If you ever see a command you have no clue what it does, type in a console window, "man whatever command". So for your question, man ifconfig .
Of course, if you really wanted to have some fun, go to Wal-Mart late at night and ask the greeter if they could help you find trashbags, roll of carpet, rope, quicklime, clorox and a shovel. See if they give you any strange looks. --Streaker69