What is a document library in SharePoint?

Document libraries in SharePoint consist of your main/core documents. For example a word document, excel, PowerPoint, Visio, pdf, csv, notepad etc. Form libraries consist of XML forms. (More...)

Document workspaces in SharePoint consist of information surrounding a single or multiple documents. (More...)

You can post documents in many formats, including .pdf, .htm and .doc. In addition, if you are using Microsoft Office XP, you can save documents directly to your Windows SharePoint Services site. (More...)

Lists are collections of metadata or columns, that can have attached documents. Libraries are collections of documents (Excel, InfoPath, Word, etc.) plus optional metadata. (More...)

You would on the ItemDeleting event set: properties.Cancel= true.
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Document libraries consist of your core documents. An example would be a word document,excel, Powerpoint, visio, pdf, etc. Form libraries consist of XML forms. (More...)

A document library is where you upload your core documents. They consist of a row and columnview with links to the documents. When the document is updated so is the link on your site. Youcan also track metadata on your documents. Metadata would consist of document properties. (More...)

Ans. You would create a event receiver for that list/library and implement the ItemDeleting method. Simply, set: properties.Cancel= true and display a friendly message using Properties.Message("How can u delete this... Its not your stuff!"); (More...)

You would on the ItemDeleting event set: properties.Cancel= true.
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The main differences between SharePoint List and Library
1. A list is a collection of information that you share with team members.
Document libraries are collections of files that you can share with team members on a Web based on Microsoft Windows SharePoint Services. For example, you can create a library of common documents for a project, and team members can use their Web browsers to find the files, read them, and make comments.
2 We can attach multiple documents to one list item, but in document library there will be only one attachment.
3. In the List the title of the document is NOT indexed. So an end user would not be able to search on the title of the document. Example: I attached a document titled "Copy of Test SPDoc.doc" but after incremental indexing I get no results searching on the word "SPDoc." But we can perform searching by title in Document Library.

4. With a list we only can SPAttachmentCollection.Add(string, byte) only accepting a byte , means the attachment must fit entirely in one continuous block memory. It this is something you do with large file , your server memory may become fragmented.
With a document library we can SPFileCollection.add(string, stream) – The document library Accept a stream, means the content can be in memory, or disk or even a TCP/IP socket.
5. We can't display the name of the attached document in the List. We only see the paperclip that signifies the attachment. Whereas in document Library we are able to see Ttile of attachment or we can modify it.
6. We can’t check in and Check out in List whereas we can check in and check out in library.
7. We can have only major versioning in List whereas in document library we have both major and minor versioning.
7. We can publish a InfoPath Form Template in document library, and this problem arises when we submit the Form in different place
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