We analyse your backlinks to pick up links to your site which have 'poor' link text. These are things like 'click here', 'visit this site' or your web address.
It is important to have a good variety of branded, unbranded, specific (e.g. golf books, florist london) and non-specific keywords (visit, click here) in your anchor text. Too many inbound links with the same anchors can be seen as an un-natural link building pattern and can result in your site being penalised by search engines.
Click on optimise to see a table of your inbound links with 'poor', i.e. very generic anchor text.