The countdown to the 2021 Formula 1 season is under way, but before the first race of the campaign there is still plenty to get done.
F1 teams need to get their new cars ready and tested on track, and before that there will be the regular launch season.
Here is what we know so far about the pre-season build up.
When is Formula 1's 2021 pre-season testing?
As part of Formula 1's cost-saving measures, the teams and the FIA agreed to reduce testing from six days down to three days for this season.
With teams limited to just a single car for the duration, it means each driver will only get one day and a half of running ahead of the opening race of the season in Bahrain.
The original plan had been for testing to take place at Barcelona in Spain in early March, but the ongoing situation surrounding coronavirus has changed things.
With lockdowns taking place in much of Europe, allied to uncertainties over the impact of Brexit travel restrictions on UK teams, it was felt that hosting it in the original location did not make much sense.
So with the original F1 season opener being moved from Australia on 21 March to Bahrain on 28 March, it made most sense for testing to take place at the Sakhir venue too.
It means there will now be a single test session in Bahrain from 12-14 March.
When are the 2021 new F1 car launches?
Formula 1 teams are currently working hard on preparing their 2021 cars , with the official unveilings expected to take place in either late February or early March.
Here is a run down of what each team has said so far.
Mercedes will launch its 2021 Formula 1 car on 2 March.
The Brackley-based outfit, which is gunning for its eighth consecutive F1 title double this year, had already confirmed that the new challenger will be called the W12.
Mercedes subsequently confirmed that the event will be a digital launch, with physical unveilings impossible to take place this year because of coronavirus pandemic restrictions.
Red Bull has confirmed that its upgraded car will be called the RB16B because it retains many parts from last year's challenger.
The car will be launched on 23 February, although no further details were provided by the Milton Keynes-based squad.
McLaren has faced perhaps the busiest winter out of everyone, as it is the only team that is swapping engine suppliers for this year.
The Woking-based outfit is moving from Renault power units to Mercedes, with its 2021 car being called the MCL35M as a result.
The team launched its car on 15 February at the McLaren Technology Centre in Woking with new driver pairing Daniel Ricciardo and Lando Norris.
The Racing Point team has been rebranded as Aston Martin for this year and, as well as a new car, it will be running with an all-new British racing green livery.
The Silverstone-based outfit has stated it will launch its car and new colours at an event on the 3 March.
The Renault team has been rebranded as Alpine for this year, as part of a push to build the French sportscar brand.
The team will run with an all-new livery and has said it will reveal its Alpine A521 on 2 March.
Ferrari will unveil its new SF21 just ahead of pre-season testing in Bahrain. The Italian outfit will hold a team launch event on 26 February, before taking the covers off its new car on 10 March.
It has also released a video of the car being fired up for the first time on social media.
AlphaTauri will unveil its new AT02 challenger on the 19 February, but no other details about its launch in a tweet.
It is expected to run the car for the first time at a filming day at Imola that will take place between 23-25 February.
Alfa Romeo was the first Formula 1 team to confirm a launch date for its 2021 car. It will reveal its C41 at an event in Warsaw on 22 February.
Haas will be running with an all-new driver line-up in 2021, with Romain Grosjean and Kevin Magnussen having been replaced by Mick Schumacher and Nikita Mazepin.
No plans have yet been announced for the reveal of its new Ferrari-powered car.
Williams will embark on 2021 with an unchanged driver line-up, as George Russell and Nicholas Latifi continue as team-mates for the second year.
The Grove-based outfit, which was purchased by Dorilton Capital last year, will reveal the FW43B on 5 March - with the team retaining the existing naming format for the cars, with a B-spec tag, from the Williams family ownership era. It will be the first B-spec Williams to race in F1 since 1995.
Will the new F1 2021 cars be different?
Although the 2021 cars must carry over the same chassis as last year, several rule tweaks have been made that will ensure some differences.
In order to help Pirelli's tyres cope with the ever faster cars, tweaks have been made to the cars to reduce downforce in 2021, particularly targeting the floor.
Pirelli was supposed to keep its 2019-spec compounds for a third season in a row, although it recently had teams test prototype tyres for next year.
Those prototypes, which feature a more robust construction, were heavily criticised by the drivers, so it remains to be seen which specification will ultimately be used.
In a further bid to reduce costs ahead of the incoming budget cap, teams will also be forced to stick to their current chassis for 2021, although they are allowed to spend so-called development tokens to rework certain areas of their cars, including the aerodynamics.
Engine manufacturers are also allowed to introduce a new power unit specification before the first race.
Launch dates at a glance
McLaren 15 February - Woking, UK
AlphaTauri 19 February - Salzburg, Austria
Alfa Romeo 22 February - Warsaw, Poland
Red Bull 23 February
Mercedes 2 March - digital
Alpine 2 March
Aston Martin 3 March
Williams 5 March
Ferrari 26 February (team launch), 10 March (car launch)