## 4 Conclusions  
The presented review highlights the importance of silver nanoparticles as an antifungal agent against both plant and human fungal pathogens. Silver is well known for its antibacterial properties, which are confirmed by numerous studies; but, currently, attention is increasingly being paid to its antifungal properties. There are far fewer scientific publications on the antifungal activity of silver nanoparticles than those presenting their antibacterial activity, but they all confirm the antifungal potential of silver nanoparticles against a wide range of fungal species, including _Candida_ sp., _Fusarium_ sp., and _Aspergillus_ sp. It was also confirmed that silver nanoparticles are effective against fungal biofilm, which is extremely resistant to treatment. In the discussion of the antifungal properties of silver nanoparticles, it is impossible not to mention the green synthesis of these nanoparticles. This is currently a common method of synthesis due to its significant environmental benefits compared to the traditional chemical synthesis. Both plants and microorganisms are used for this purpose. Silver nanoparticles synthesized in this way show excellent antifungal properties against the tested species of fungi. In addition, research confirms that silver nanoparticles can be successfully combined with antifungal drugs used so far, enhancing their effect on fungal cells. All the studies presented in this review lead to the conclusion that silver nanoparticles are a good candidate for antifungal treatment, both as an alternative to the currently used antifungal drugs and in combination with these medicines. Therefore, they can be used in the treatment of fungal diseases of plants, including crops, and in the treatment of problematic human infections caused by resistant fungi. Moreover, many articles indicate the potential of using AgNPs for anticancer treatment, as research shows that AgNPs inhibit the proliferation of various cancer lines, including breast, prostate, and lung cancer. Another possible medical application is the treatment of wounds or use as a doping material for synthetic bone scaffolds or dental biomaterials, providing protection against potential bacterial infections. Apart from medical applications, other possible uses of AgNPs include the disinfection of surfaces, water, and air, as well as food processing and storage. Despite the efforts of many researchers, and although more is increasingly known about the mechanisms of action of AgNPs on cells, this knowledge is still not sufficient and further research is needed to understand the exact processes. The factor limiting the use of AgNPs is their toxicity to humans, which, however, largely depends on the size of the particles, shape, method of synthesis, and the route and time of exposure. The next challenge concerns the method of green synthesis of AgNPs. Although this is a common, environmentally friendly method, it requires further development, including, in order to obtain the homogeneity of nanoparticles, investigating how the substances present in the plant extract affect the structure and stability of nanoparticles and the technological innovations that are necessary to enable the use of these methods on a larger scale. Moreover, there are many plants and microorganisms in the environment whose synthesis has not yet been tested; therefore, further searches are necessary to identify the most efficient biological agent for this process. To conclude, AgNPs open a new path towards the development of new drugs and therapies for many plant and human diseases, even those with high mortality, such as cancer or treatment-resistant fungal infections. However, nanotechnology is a constantly developing field, so further research is necessary to make AgNPs not only effective but also safe, firstly, for ourselves and, secondly, for the environment around us.  
This research received no external funding.  
The authors declare no conflict of interest.