Since returning to the tour last season after her daughter was born on September 1, 2017, Williams has reached the finals at three of six major tournaments she entered, defeated in straight sets each time.
The first set demolition took people's breath away and it continued in the second as Halep finished with just three unforced errors to Williams' 26. She hasn't won a Grand Slam title since the 2017 Australian Open and her pursuit for that milestone continues.
Although Serena extended her streak of reaching at least one Grand Slam final to 13 consecutive years, her 32nd career major final did not go well.
Williams will play for her eighth Wimbledon title.
"The day before the women's final, eight-time Wimbledon victor and Halep's idol Federer overcame Rafael Nadal in his semi-final, before offering his support to the world number seven, saying she should "back herself" and show a "winner mentality". She is also now the first Romanian to win a singles title at the All England Club.
Annabel Croft, a former British No 1, said Serena will have to keep a lid on her emotions this time because so much is at stake.
Halep had previously said she hoped members of the Royal Family would be in the stands to watch her match, and was thrilled she finds out Duchess of Sussex Meghan Markle and Duchess of Cambridge Kate Middleton were in attendance.
She added: "Just trying to tap into that younger Serena, trying to tap into how to win, basically".
Williams ramped up the power and angles of her shots to start the second set. "So today it's real and I'm really happy".
"The fact that I am able to win maybe will give an inspiration also to Romanians, the kids, that it's possible, even if you come from a little country, it's possible if you work and if you believe". "I'm always expected to win, but it's a different circumstance for me", Williams said.
"She played unbelievable. That makes me know that. she can get there again".
"Looking back, to even be in those two finals previous year was unbelievable", she said. I have never played a better match. You're an absolute legend, I loved winning the doubles with you yesterday and you're a great bloke. Each time she hit a signature placement or teed off on a Halep serve, an error soon followed to wipe out her advantage. I just did natural what it came in my inside. "I appreciated it. I wanted to do better". I respect a lot what she has done and what she's doing.