With the Blog template you can create pages that will publish your blog posts.
For every blog page you can set the number of posts displayed on a page, the size and alignment of thumbnails, the type of previews (teaser, excerpt or whole content), which meta-information you want to publish, etc.
Some features can be customized for every single page independently of the template you have used to create them - this applies to blog pages as well.
Such are the settings that apply to the subheader or the footer and the breadcrumb settings.
You can also set according to which categories the blog posts should be displayed.