The synthesis and modification of existing or new nanofillers is being achieved in the field of nanotechnology for aerospace and automobile applications. The addition of such nanofillers to the matrix of composites has been shown to significantly enhance their technological qualities. The most commonly used nanofillers include silica and carbon, and many studies on their various applications have been carried out, and these new materials, such as aluminum, magnesium, silicon carbide, titania, and zinc oxide, are used to develop nanofillers. All of them are widely used nanofiller materials for making composites. Hybrid composites constitute a type of material that combines two or more types of fibers or matrices to create a composite material with unique properties. These properties can be tailored to meet specific performance requirements for a variety of applications. They possess numerous advantages, like extreme durability, a low weight, and corrosion resistance, at low levels. The use of two morphologies of silica nanoparticle filler material, namely nonporous and mesoporous silica nanoparticles, in eglass and jute composites is researched in this chapter. The mechanical testing focuses on tensile, compression, flexural, impact, and hardness tests. The results show that composites have better mechanical properties when nanofillers are incorporated into them, and composites comprising mesoporous silica nanoparticles (MSNs) show higher tensile and flexural strength values than those of nonporous-based composites, but overall, nonporous-based composites possess better mechanical properties than others when tested.