PlayStation Plus is an online service which gives free games and discounts to loyal Playstation fans. If you have an active PS Plus subscription then you will receive new free games each month. All games will be playable during your active membership.
New games for PS4 will be available from the 3rd of April, so until then you can still download the previous games: PlayStation Plus Free Games – March 2019

See below for the list of games in April, along with Metacritic scores from critics and players.

You can get PSN wallet funds and PS Plus Subscription from our store:

Conan Exiles

Metascore: 68/100
User Score: 5.5/10

The Surge

Metascore: 73/100
User Score: 6.8/10

 

Source: PlayStation Blog