Does every differential equation have a real solution?

Not every differential equation has a real solution. The existence and uniqueness of solutions depend on the specific form of the equation and the initial or boundary conditions applied. For example, some equations may have no solutions, while others may have multiple solutions or only solutions that are not real. Theorems such as the Picard-Lindelöf theorem provide conditions under which solutions exist, but these conditions do not universally apply to all differential equations.