ClassName (Property)

This is a read-only property. It cannot be written to, only read.

ClassName
Type	string
Description	A unique string per type of Instance. Should only be used as a unique identifier, as it does not reveal any information about nature of the type hierarchy the type is in. For this use, see IsA.
Member of	Instance

Example

for _, child in ipairs(part:GetChildren()) do
    if child.ClassName == 'Part' then
        -- will find Parts, but NOT TrussParts, WedgeParts, and other part-like objects
    end
end