Services create a bridge for Applications.

Function of Services
With Services, you can quickly draw the power of other Application even though you're not within that other Application. For example, you can take snapshot while using TextEdit.

Some Services
Several Services are available, and until now, still developing. Some examples of Services:

1. Grab
2. Dictionary
3. Mail
4. Quicksilver
5. Sticky Note
6. Open URL
7. Google Search

Grab
Grab is useful for taking snapshot. Since the Services cannot independently create a file, the snapshot will be attached to document. There are 3 kinds of Grab: Screen, Selection and Timed Screen which can be found at Menu Bar → Main Menu → Services → Grab.

Dictionary
With Dictionary, you can search the definition of highlighted word. Dictionary is located at Menu Bar → Main Menu → Services → Look Up in Dictionary.

Mail
Mail Services let you send your selection or your file. It's located at Menu Bar → Main Menu → Services → Mail

Quicksilver
Quicksilver Service help you to quickly pass your selection to Quicksilver or directly pass up your file. It's provided on Menu Bar → Main Menu → Services → Quicksilver or keystrokes for quickly passing up selection.

Sticky Note
Pass up selected words to create new Sticky Note. Sticky Note Service can be found at Menu Bar → Main Menu → Services → Make New Sticky Note or performed using keystrokes Y would be fine.

Open URL
Passing current selection to browser to open. For example, if your highlighted word is apple, passing it to Open URL Service will have your browser open www.apple.com. Menu Bar → Main Menu → Services → Open URL is where it's located.

Google Search
This Service searches your highlighted texts in your default browser. For some Applications, keystrokes L could be used. If the keystrokes cannot be used, you can alternatively use Menu Bar → Main Menu → Services → Search with Google.