In English, we can say I have the newest computer. In German, when you want to say something is the newest or the highest, you can add ‑ste to the adjective (or ‑este if the letter before it is a vowel).
Das ist der höchste Berg der Welt.
That is the world’s highest mountain.
Das sind die neuesten Daten.
Those are the newest dates.
Don’t forget to use the endings that match with the noun’s gender and case!