This paper reports on the controlled writing and deletion of single magnetic skyrmions in an ultrathin magnetic film using local spin-polarized currents from a scanning tunneling microscope (STM). Magnetic skyrmions are topologically stable spin configurations with a quantized topological charge. The study demonstrates that individual skyrmions can be created and annihilated by adjusting parameters such as magnetic field, temperature, and current injection. The magnetic field tunes the energy landscape, while temperature prevents thermal switching between topologically distinct states. The switching rate and direction are controlled by current injection parameters. The research shows that magnetic skyrmions can be manipulated with significantly smaller current densities compared to domain walls in conventional ferromagnetic systems, making them promising for spintronic applications. The PdFe bilayer on Ir(111) was used to study skyrmion manipulation. At low temperatures, the system exhibits a spin spiral phase that can be converted into a skyrmion lattice with an external magnetic field. Skyrmions can be written and deleted using local voltage sweeps and spin-polarized tunneling currents. The study also shows that skyrmions can be individually addressed and manipulated, even in close proximity. The switching process is sensitive to the energy of the tunneling electrons and the direction of the applied magnetic field. The results demonstrate the feasibility of using spin-polarized tunnel currents for the controlled manipulation of individual skyrmions. The study highlights the potential of topological charge for future information-storage concepts.This paper reports on the controlled writing and deletion of single magnetic skyrmions in an ultrathin magnetic film using local spin-polarized currents from a scanning tunneling microscope (STM). Magnetic skyrmions are topologically stable spin configurations with a quantized topological charge. The study demonstrates that individual skyrmions can be created and annihilated by adjusting parameters such as magnetic field, temperature, and current injection. The magnetic field tunes the energy landscape, while temperature prevents thermal switching between topologically distinct states. The switching rate and direction are controlled by current injection parameters. The research shows that magnetic skyrmions can be manipulated with significantly smaller current densities compared to domain walls in conventional ferromagnetic systems, making them promising for spintronic applications. The PdFe bilayer on Ir(111) was used to study skyrmion manipulation. At low temperatures, the system exhibits a spin spiral phase that can be converted into a skyrmion lattice with an external magnetic field. Skyrmions can be written and deleted using local voltage sweeps and spin-polarized tunneling currents. The study also shows that skyrmions can be individually addressed and manipulated, even in close proximity. The switching process is sensitive to the energy of the tunneling electrons and the direction of the applied magnetic field. The results demonstrate the feasibility of using spin-polarized tunnel currents for the controlled manipulation of individual skyrmions. The study highlights the potential of topological charge for future information-storage concepts.