How to Politely Decline a Meeting Invitation When Busy

If my colleague invites me to a meeting but I am busy, I would politely decline the invitation. I would approach him/her and explain that I have prior commitments or a heavy workload at the moment, which prevents me from attending the meeting. I would express my gratitude for the invitation and apologize for not being able to participate. I would also offer to provide any necessary assistance or information remotely, if possible, to show my willingness to contribute despite my unavailability.