SharePoint 2007: The Definitive Guide
by James Pyles, Christopher M. Buechler, Bob Fox, Murray Gordon, Michael Lotter, Jason Medero, Nilesh Mehta, Joris Poelmans, Christopher Pragash, Piotr Prussak, Christopher J. Regan
Sites Versus Site Collections
Before you begin creating sites, it's important to know which features you need to meet your goals. Your first choice is to create either one top-level site and several subsites as a single site collection or several independent top-level sites and subsites under each top-level site in multiple site collections. Figure 5-1 and Figure 5-2 illustrate the differences.

Figure 5-1. A single site collection showing one top-level site and several subsites

Figure 5-2. Two separate site collections, each one containing a top-level site and several subsites
Security is the primary driver of your choice of site structure. Separate site collections don't share the same navigation structure, elements, or parent permissions and must be administered separately. Table 5-1 demonstrates the differences.
Table 5-1. Single and multiple site collection features
|
Single site collection |
Multiple site collections |
|---|---|
|
Shares navigation. |
Do not share navigation. |
|
Subsites inherit permissions from parent site. |
Permissions are not inherited among site collections. |
|
Lists are shared within the site collection. |
Lists are not shared among site collections. |
|
Design elements are shared within the site collection. |
Design elements are not shared among site collections. |
|
The site collection ... |
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