Blood may be thicker than water, but a really great friend can become as important as family.
And best friends - as we all know - are top of the friendship tree.
But what makes someone not only a good friend, but a BEST friend?
Well, thanks to Hallmark - who polled 2,000 adults on all things best friend related to celebrate the 30th anniversary of Forever Friends - we now know.
As well as the top 30 signs someone is a true best friend, the poll - which was conducted by OnePoll.com - also discovered that the majority of Brits meet their bestie at school. Interestingly, the second most common place to meet your BFF is work, with uni coming in third place.
30 signs someone is a true BEST FRIEND
Friends Cast: Then and Now
1 of 22Then
James Michael Taylor as Gunther, the barista holding a torch for Jennifer Aniston's Rachel Green. Taylor was the show's most frequent guest star, appearing in 148 out of 236 Friends' episodes.
2 of 22Now
James - aka Gunther - made a super short appearance in the Friends reunion - without his trademark blonde hair!
3 of 22Then
Cole Sprouse, as Ross and Carol Willick's son, Ben.
4 of 22Now
Since starring on Friends, Sprouse acted alongside his twin brother, Dylan, on Disney Channel series The Suite Life of Zack and Cody and its spinoff The Suite Life on Deck. Most recently, Sprouse has starred as Jughead Jones on teen drama Riverdale.
5 of 22Then
Twins Noelle and Cali Sheldon played Ross and Rachel's daughter, Emma.
6 of 22Now
According to IMBD, both twins have appeared in shorts over the years, but their biggest role to date was in horror film Us last year.
7 of 22Then
Giovanni Ribisi as Phoebe's half-brother, Frank Buffay, Jr.
8 of 22Now
Ribisi is best known for starring in TV series Sneaky Pete. He has also appeared in the films Saving Private Ryan, Avatar, A Million Ways to Die in the West and Ted.
9 of 22Then
Maggie Wheeler played Janice, a recurring character who was Chandler's long-time on-off girlfriend.
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10 of 22Now
Wheeler is best known for her role as Janice, but has since starred in Everybody Loves Raymond. She also made an appearance in the Friends reunion, looking almost exactly the same!
11 of 22Then
Little-known actress Jennifer Aniston played Rachel Green.
12 of 22Now
One of Grazia's favourite people, Aniston has gone on to have a very successful acting career, starring in films like Just Go With It, Rumor Has It, and The Break-Up. Most recently, Aniston starred in brand new AppleTV show The Morning Show alongside long-time friend and former on-screen sister, Reese Witherspoon, for which she won a SAG Award.
13 of 22Then
David Schwimmer as Ross Geller.
14 of 22Now
In 2016, Schwimmer appeared in the American Crime Story series about the assassination of Gianni Versace. In early 2019, he had to prove his innocence to Blackpool Police after a lookalike thief was caught on CCTV and he made an appearance at this year's National Television Awards.
15 of 22Then
Courteney Cox as Monica Geller.
16 of 22Now
Since starring in Friends, Cox has had a successful acting career, earning a Golden Globes nomination for her role as Jules Cobb in Cougar Town. She is also still very close friends with Jennifer Aniston.
17 of 22Then
Actor Matthew Perry as Chandler Bing.
18 of 22Now
Perry is best known for his role as Chandler, but he has since appeared in 17 Again alongsideZac Efron.
19 of 22Then
Matt LeBlanc as Joey Tribbiani.
20 of 22Now
After Friends ended, LeBlanc starred in his own spin-off show, Joey, which ran for two seasons. LeBlanc received three Emmy's nominations for his role as Joey on Friends.
21 of 22Then
Lisa Kudrow as Phoebe Buffay.
22 of 22Now
Kudrow is best known for her role as Phoebe on Friends and received a Screen Actors Guild Award nomination for her work. She also gained plaudits through Web Therapy and The Comeback. She is also still close friends with former co-stars Jennifer Aniston and Courteney Cox.
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We love watching a celebrity friendship blossom, with Kerry Katona and Katie Price's friendship gal pal goals and all the Love Islander's getting on like a house on fire and Pete Wicks and Sam Thompson's #bromance the stuff of legend.
But 2020 hasn't exactly been the best year for catching up with our pals, with the ultimate squad – the cast of Friends – having to postpone their much anticipated reunion thanks to the 'rona.
Apparently, a new filming date has not yet been set amid the virus, with The Hollywood Reporter reporting, "A formal filming date has not yet been determined as it's unclear when any programming will be able to resume production."