Who are your visitors?

Do you look at your blog website who is visiting you?
You can login your control panel ( in your hosting package ) and look at your site stats. Even though it does not give you detail page information as much as Google Analytic does, still give you some idea who are your visitors.
Most people look at total number and think their site have good hits.
Well, that not true entirely.
Usually a lot of hits come from robots and spiders not individual users.
Also you need to be aware of many spammers will come to blogs to find any way to leave their spam ads as comments.
To understand the difference look at if a domain name / IP address keeps coming to your blog, and that IP has nothing to do with your site, then it is either a spammer or bad robot hitting your site.
You can try to block any IP address to stop visiting your site, but be aware that IP blocking is not a good idea, for two reasons:

1. Majority of IP address on the web are dynamic. The IP numbers will be changing for the same domain name frequently.

2. Most spammer IP addresses are faked.

Your attempt to block the IP, will last about 24 hours. Instead you should block certain keywords and domain names.

You can use .htaccess to deny certain domain access. Here is the code:

<Limit GET>
order allow,deny
allow from all
deny from .baddomain.net
deny from .baddomain.com

Useful WordPress Plug-ins

Ban users by IP, IP Range, host name, user agent and referer url from visiting your WordPress’s blog. It will display a custom ban message when the banned IP, IP range, host name, user agent or referer url tries to visit you blog. You can also exclude certain IPs from being banned. There will be statistics recordered on how many times they attemp to visit your blog. It allows wildcard matching too.
By Lester ‘GaMerZ’ Chan

IP Filter
Grants or denies access to a list of IP addresses.| By Hautclocq Gabriel

Google Analytics Plugin
Easy to install and configure
Optimized to use minimum of resources By Adrian Ianculescu.

Daily Stat
Improved real time stats for your blog | By luciole135