The Rock is a former professional wrestler and actor who has won multiple championships in his wrestling career. He won his first WWE Title by defeating Mankind. Let's break down the answer into headings and HTML bullet points:

Background:
- The Rock began his wrestling career in 1996 and quickly rose to stardom in the WWE.
- He became a fan favorite due to his charismatic personality and catchphrases.

The WWE Title:
- The WWE Title is the highest accolade in the WWE and is awarded to the wrestler who is deemed the best in the company.
- The title has been held by some of the biggest names in wrestling history, including Hulk Hogan, Stone Cold Steve Austin, and John Cena.

The Match:
- The Rock's first WWE Title win came on November 15, 1998, at the Survivor Series pay-per-view event.
- He faced off against Mankind, who was a popular wrestler known for his hardcore style.
- The match was a "tournament final" to determine the new WWE Champion.
- The two wrestlers put on a brutal and intense match that saw both men take a considerable amount of punishment.
- In the end, The Rock emerged victorious after hitting Mankind with a Rock Bottom and a People's Elbow.

Aftermath:
- The Rock's win marked the beginning of his reign as one of the top wrestlers in the WWE.
- He went on to win the WWE Title several more times in his career and became one of the most popular wrestlers of all time.
- Mankind and The Rock continued to feud over the next few years, putting on some of the most memorable matches in WWE history.

In conclusion, The Rock won his first WWE Title by defeating Mankind in a tournament final at the Survivor Series in 1998. The match was a brutal and intense affair, and The Rock emerged victorious after hitting Mankind with his signature finishing moves. The win marked the beginning of The Rock's rise to stardom in the WWE and cemented his status as one of the top wrestlers of all time.