Harry Potter, Little Red Riding Hood and the Mad Hatter are just a few of the famous characters you might see children dressed up as today to mark World Book Day.
Now in its 20th year, the annual celebration of reading is celebrated across the world.
You've been sending in your photographs - here's a selection of our favourites!
Twins Ellis & Esmé, 7 months, as Thing 1 and Thing 2 in Caerphilly. Credit: Tasha Gittings5-year-old Mollie, from Ruthin in Denbighshire, as Little Red Riding Hood Credit: Katrina BarnesKaylum, 9, and Skyla, 7, in Caerphilly Credit: Sarah DaviesRiley, aged 10, from Neath... last one before comp! Credit: Natasha BaileySuhana Uddin, aged 9, dressed as the BFG and Haaq Uddin aged 5 dressed as an oompa loompa Credit: Nanu MiahFrazer Short as Harry Potter Credit: Wendy ShortMaisey Gifford, age 7, Molly Gifford, age 4, as Miss Honey and Matilda Credit: Rebecca GiffordGeorgie Nolan aged 10 from Troedyrhiw, Merthyr Tydfil, dressed as Moaning Myrtle from Harry Potter Credit: Sarah NolanErin-Anne Pryce,aged 10, as the Mad Hatter Credit: Kirsty Davies
Lara, 9, as Bat Girl in Swansea Credit: Emily WiltonIeuan George, 3, as the Very Hungry Caterpillar in Tonyrefail. Credit: Jeremy and Lianne Cowell Mackenzie Robertson, 10, as Oliver Twist in Hengoed. Credit: Rebecca GiffordDanny, 7, as Ron Weasley and Laylah, 4, as Annie. Credit: Ceri Williams Twins Llew & Gruff Jones, 6, as TweedleDum and TweedleDee in Cwmllynfell. Credit: Emma JonesJack Rigdon, 7, as Flat Stanley in Swansea. Credit: Louise RigdonIsobel Edwards as Little Red Riding Hood. Credit: Sue WilliamsMadi Cook, aged 11, as 'Madi Potter'. Credit: Jo CookL-R: Phoebe Tuck (4) as 'Where's Phoebe?', Ollie Tuck (9) as TinTin and Bevan Tuck (10) as Gareth Bale. Credit: Emma Tuck
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