Advertising on LinkedIn is mostly about sponsored content. The interesting part on LinkedIn is the professional audience that can be targeted not only based on location but also based on professional characteristics such as seniority or industry for example.
Other advertising option on Linkedin
Besides Sponsored Content, which is by far the most popular option, the LinkedIn campaign manager offers also paid In-Mail as well as text ads. Alternatively, it also possible to purchase ad inventory through programmatic ad buys.