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Blocks are the one of the basic and most fascinating features of Drupal. With block you can display information in the form of block by saving and utilizing the screen area. Here is an example of implementation of hook_block

<?php
/**
* Implementation of hook_block
*
* @param $op
* @param $delta
* @param $edit
* @return $block
* @author Drupal Developer
*/
function browse_info_block($op = 'list', $delta = 0, $edit = array()) {
switch ($op) {
case 'list':
$blocks[1] = array(
'info' => t("Browse information by category"),
'status' => 1,
'region' => 'content',
'weight' => 0,
);

return $blocks;
case 'configure':
$am__vocabulary = _get_vocabulary();
$am__imagecache = _get_imagecache();

hook_install() creates tables in the database for the module to which its associated. hook_install not just restricted creating tables but it also creates vocabularies, terms in the vocabularies and sets variables to be used by modules. The hook_install set ups the basic requirement for a module to function properly. Not all the modules require to implement hook_install but which saves data to own tables and for providing extra features for which there are no tables or fields exists from where information can be fetched.

• Drupal 5: Table definition and all other required set up for the module
• Drupal 6, 7: drupal_install_schema('[hook]')

Here is an example of hook_install()

<?php
/**
* Implementation of hook_install
*

When Developing a custom module for Drupal, we need to use Drupal APIs and we need to make use of Drupal hooks. There are many Drupal hooks available and different hooks go in different files.

In this section we will learn about all those required hooks which should be written when developing a custom Drupal module.

First we will look at the hooks which are written in .install file.

I'd like to make a note here that don't mistaken the .module as the Drupal module. A Drupal module is consist of one or more .module file, one or more .info file and optionally, one or more .install file.

So, first we look at the hooks in .install file.

hook_install()

• Drupal 5.x - Table structure and other items like vocabulary and its terms to be used by the module.

Drupal is one of the most fascinating Open Source CMSes available on the web. With Drupal, one can publish a site in few minutes. The learning cure of Drupal is some what steep when it comes to write codes or developing a theme for Drupal. Drupal is fully dynamic, controllable CMS. So, all the aspects of the website is in full control. You can change the shortcut icon with few clicks!!! That's the power of Drupal.
Drupal offers most of the features out of the box. With installing Drupal, you will have registration, permissions, user management and content management system. What you can add to this feature is either you enhance them in your own code or tweak the behavior a bit.
The code we develop to do such things are called 'Modules' in Drupal terminology.