Can i have a blog within my website?

Yes, you can. You can integrate a "blog" within your site so visitors stay within your site moving freely between pages. If your blog is the main event, you could do the reverse - build your site within your blog!

A "site-blog" (as opposed to a blog site) should be customized to blend with the site's theme to keep the same look and feel for your visitors. Your visitors should be able to navigate with ease in and out of your blog and the rest of the site.