SEO Link Exchange is an important activity for all those who want a better index portal, but it is to be used with extreme caution.
First of all you should know that there are “link Exchange” programs where some sites, called “directory”, offer free (or in some cases a fee) the ability to place a link to your company website. Whilst it is true that these sites, long ago, could have a sense, this is no longer the case.
The first thing to check is the QUALITY of a link exchange through a link exchange control REPUTAZION of the website where you want to insert the link to your company.
The link exchange is then considered in value when the website “friend” has a good rank on various search engines (not only Google exists!). Normally domains .edu or .org are better considered than others (as long as the content Portal actually reflects an educational purpose or associative). It’s important to do link exchanges with sites that talk about related subjects, or with companies that are your business partners, not just to get a better ranking on search engines, but also (and especially) to be OBJECTIVELY useful to a potential user browsing the site.