Graphene is a remarkable material composed of a single layer of carbon atoms arranged in a hexagonal lattice (similar to a honeycomb structure). It is essentially a two-dimensional substance.

Thinnest: Graphene is the thinnest material known to humanity. It consists of a single layer of carbon atoms arranged in a hexagonal lattice. Imagine a sheet of graphene as thin as a single atom

Strength: Graphene is the strongest material ever studied, exhibiting tremendous tensile strength at the atomic scale.

Conductivity: It boasts exceptional electrical and thermal conductivity due to the presence of free pi-electrons in its structure. 

Flexibility: Graphene is extremely flexible. Despite its atomic thinness, it can bend, twist, and conform to various shapes without breaking. This property makes it an ideal candidate for flexible electronics, wearable devices, and even futuristic clothing.

Impermeable: Graphene acts as an impermeable barrier for most gases and liquids. Even helium atoms struggle to pass through its tightly packed carbon lattice. This impermeability has implications for applications like water filtration and protective coatings.

Thickness: Graphite is thicker since it comprises several/ many layers of carbon, whereas graphene is a single or few layers not uniformly stacked together.

Flexibility: Graphite is less flexible compared to graphene. Its layered arrangement makes it more rigid, and it tends to break along the layers.