Essentially, a PTO is a temporary contract that an NHL team can give to a former NHL player who hasn't been signed by anyone else. The team has no legal obligation to keep them if they do not pan out.
Many NHL pundits and fans believe that this will be the end of the road for Anisimov, as he has had an interesting career thus far, playing 771 games for the NHL. He scored 180 goals with 196 during his time with the Blue Jackets, Blackhawks, and Senators.
The Flyers' farm team, the Lehigh Valley Phantoms, was another stop for him as he attempted to come back into the NHL, where he scored nineteen goals with 17 assists.