The Harry Potter author will talk to children about her writing and what books she likes reading.

During the chat JK will also answer 12 special questions from winners of a Festival competition open to all schools in the UK.

She'll be joined for the Online Festival by other authors including Jamila Gavin.

It's all part of the seventh annual World Book Day which features lots of book related events.

Millions of £1 tokens will be given out at schools, which can be exchanged for specially produced books including Cool! By Michael Morpurgo and Artemis Fowl: The Seventh Dwarf by Eoin Colfer.