Every single good carpenter and DIY'er needs a durable, dependable circular saw in their tool collection.  The incredible adaptability of the circular saw will allow it to do an incredible diversity of jobs, making it amongst the more popular tools around most woodworking shops.  The option to change the depth and angle of your cut opens up the door to many possibilities. 
 
There is 2 standard kindsof circular saws on the market today: in-line circular saws and worm-drive circular saws.  The biggest difference between them is the position of the motor, which significantly impacts the amount of torque delivered.  With a worm-drive saw, the motor is secured parallel to the blade.  This style allows the motor to transfer a large amount of power to the blade, enabling it to cut through all kinds of stuff, from wood to metal.  Generally, most professional tradesmen use worm-drive saws on account of the additional power and flexibility.  All the same, the higher torque also makes them a lot more dangerous than in-line saws.  Because of this, it is my opinion that worm-drive saws should only be used by professionals.  Here's a bit more info on that topic here: 
[http://circular-saw-reviews.info/porter-cable-pc13csl-review/ read this post here]

For typical DIY and hobby use, an in-line (or sidewinder) saw is a very good option.  Although in-line saws make less power than a worm-drive saw, most in-line saws should have no problem handling almost any task you are able to throw at it, except massive industrial construction.  Additionally, they're just safer, lighter and generally easier to use.  You want to make sure the circular saw you pick out includes an electronic brake.  This feature will cause the flow of electricity to be reversed as soon as you let go of the trigger, causing the blade to stop quickly.  This is a key and helpful safety feature. 

If portability is essential to you, you'll want to look at a cordless circular saw.  These allow you to use them virtually anywhere, without needing bulky extension cords and a generator.  You'll find a few disadvantages to battery powered circular saws: they've got less torque than their wired counterparts, and you are restricted by the runtime of the battery .  It is possible to purchase additional battery packs to lengthen the run time, but you need to remember to have them all charged and ready to go, which can be annoying.

Always consider the type of work you may be performing before buying any power tool.  This is particularly right with circular saws.  If you find that you change blades fairly regularly, getting one with a quick-change option could save you a lot of time later on.  If you'd like deep cuts, you will need a saw with a blade size large enough to meet your requirements.  Additionally, be sure you check out a few circular saw reviews before you make your purchase to make certain you buy the best circular saw around.

Just like I wrote before, every craftsmen and DIY'er needs a solid, reliable circular saw in their tool collection.  The awesome versatility of the circular saw makes it possible for it to do an amazing diversity of chores, rendering it one of the most in-demand tools in most wood-working shops.  The flexibility to change the depth and angle of your cut opens up the door to a lot of possibilities.
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