Tributlation or persecution refers to the suffering, which accompanies faithfulness to Christian principles. All of the Christians will experience kind of tribulation or persecution for our faith. In some of the countries Christians may face persecution and put them in dangers. For others Christians, we may face someone who against our faith or situation that will put our faith in test.
In Revelation 21:12 "Behold, I am coming soon! My reward is with me, and I will give to everyone accordingly to what he has done." That is God's promise and we should aim for it.
Just also like Paul's saying in 2 Timothy 4: v8 "Now there is in store for me the crown of righteousness, which the Lord,