What does a 'frozen ranking' mean?

In a joint statement from the WTA Tour and ATP Tour, and in conjunction with the International Tennis Federation, the professional tennis season has been suspended through July 13, 2020.
In response to the current suspension of the season, the WTA Rankings have been frozen until play resumes.
What does a “Frozen Ranking” mean?
A Frozen Ranking means a player’s ranking as of March 9, 2020 will remain in place until play resumes. Points earned during the 2019 Indian Wells tournament will remain on a player’s ranking, as well as the points earned across all levels in the weeks that followed through March 9, 2020.
In short, a player's Frozen Ranking includes all points earned from 2019 Indian Wells through March 9, 2020.
The WTA Player and Tournament Councils, WTA leadership team, along with the ATP and ITF, continue to work on the process moving forward.
UPDATED: The WTA’s rankings freeze also applies to any time-sensitive rankings records and milestones such as weeks at No.1 or weeks in the Top 10.
The Top 20 Singles and Doubles at the time rankings were frozen:
Singles
No.1 Ashleigh Barty: 8,717 pts
No.2 Simona Halep: 6,076 pts
No.3 Karolina Pliskova
No.4 Sofia Kenin
No.5 Elina Svitolina
No.6 Bianca Andreescu
No.7 Kiki Bertens: 4,535 pts
No.8 Belinda Bencic
No.9 Serena Williams: 3,915 pts
No.10 Naomi Osaka
No.11 Aryna Sabalenka
No.12 Petra Kvitova: 3,566 pts
No.13 Madison Keys
No.14 Johanna Konta: 2,803 pts
No.15 Petra Martic
No.16 Garbiñe Muguruza: 2,711 pts
No.17 Elena Rybakina
No.18 Marketa Vondrousova
No.19 Alison Riske: 2,256 pts
No.20 Maria Sakkari
For full singles rankings, click here.
Doubles
No.1 Su-Wei Hsieh: 8,350 pts
No.2 Barbora Strycova: 8,260 pts
No.3 Kristina Mladenovic
No.4 Timea Babos: 7,995 pts
No.5 Aryna Sabalenka
No.6 Elise Mertens
No.7 Gabriela Dabrowski: 5,650 pts
No.8 Barbora Krejcikova
No.9 Katerina Siniakova
No.10: Yifan Xu: 5,230 pts
No.11 Anna-Lena Groenefeld: 4,495 pts
No.12 Demi Schuurs: 4,155 pts
No.13 Ashleigh Barty: 4,060 pts
No.14 Latisha Chan: 3,905 pts
No.15 Hao-Ching Chan: 3,905 pts
No.16 Yingying Duan: 3,810 pts
No.17 Jelena Ostapenko
No.18 Victoria Azarenka
No.19 Nicole Melichar: 3,415 pts
No.20 Bethanie Mattek-Sands: 3,220 pts
For full doubles rankings, click here.
This post was updated on April 14, 2020.