A link containing the address of a web page that is located outside it is considered to be outgoing to the site. In other words, the outgoing link always points to a page located on a third-party resource. 

Any link at the same time is incoming and outgoing: it all depends on what role two of the linked sites have for donor she will be outgoing, but for acceptor incoming.
Each link has the ability to bear weight, which is one of the main factors of formation web page weights (its significance) and has a significant impact on them position in the issuance of search engines. The same goes for those who come. 

Therefore, when engaged in the SEO-promotion of the site, it is desirable to control the number of outgoing links - they should be at least. If you can’t get rid of some of them in any way, you should consider using the rel = ’’ attributenofollow’’, which, although it will make them inactive (non-clicable), but it will close them from indexing by search engines. And here are incoming quality links with thematic authoritative resources should be as large as possible.

If we consider not progress, but monetization attractive website (tis and "temporarily rested PR), then outgoing links from its pages are one of the main options for making a profit. At the same time, the correspondence of the subject of the round-table text with anchor links and the contents of the page he leads to are important for both the donor and the acceptor, since in the opposite case, search engines may suspect both of them of participating in the diagrams reference spam, for which the corresponding will be applied sanctions