According to Apple official web site, users can set up iPhone or iPod touch to sync with their computers. And these syncable contents are listed:
* Contacts—names, phone numbers, addresses, email addresses, and so on
* Calendars—appointments and events
* Web bookmarks
* Music and audiobooks
* Photos
* Podcasts
* Movies and TV shows
* Applications
So if you have an iPhone or iPod Touch, and there are many things in your iTunes library, you may make syncing between them from time to time. However, for some computer beginners, they are not familiar with it, though this is a very basic but important operation. If you're one of them, this page will help.
Step 1, connect your iPhone or iPod Touch with computer.
Step 2, launch iTunes and your device will be recognized automatically. You can find it under DEVICES on the left panel of iTunes:

(Note: the device name "iPhone/iPod Touch" might be different from yours)
Step 3, click on this device and on the main window of iTunes, there's a
button under Summary tab. But remember, this will sync all your iTunes library to iPhone / iPod Touch. If you just want to import part of the library, just go to the corresponding tab, and change the sync options to Selected and check items going to be synced:

How to
Like pictures above, left one shows you that only sync first two movies; right one shows only sync last two applications. And remember to click Apply button to active such sync actions.
After a while, the sync will be complete. Now, check your iPhone or iPod Touch, and you will find Sync operation is helpful and very easy.
Warning
If you find your desired movies could not be synced to iPhone / iPod Touch successfully, you should check if the source video is suitable for your device. Because on their official page, there are many parameters for their video format:
Video Format: MP4, MOV, M4V
Video Size: up to 640x480
Video Framerate: up to 30fps
Video Bitrate: up to 1.5Mbps for H.264, or 2.5Mbps for MPEG-4
Audio: AAC up to 160Kbps, 48kHz
In this case, you may need a video converter to get iPhone/iPod Touch video first. Any Video Converter is a great choice. And you can download and install it from this link.
And you can check tutorials on how to convert video for iPhone or convert video for iPod Touch.
Note: If you a Mac system user, you can use Any Video Converter Ultimate for Mac to transfer audio/video/photo directly between Mac and your devices such as iPod and iTunes. No need to synchronize your iPods to iTunes anymore.
"Just purchased and used Any DVD Converter with my Sony NWZ-A818 - Absolutely brilliant. Whats more it even allows me to burn videos to my Sony-Ericsson 800i mobile phone, which is an unexpected bonus." -- John Smith
"Any Video Converter couldn't be much easier to use, and it supports batch conversions--always a nice perk. You'll definitely want to add this utility to your video arsenal. " -- Rick Broida
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