Basically i was planning to invest some of my saving on a good String vst and i googled "best vst plugins 2017" and got a recommendation on KOMPLETE and KONTAKT. I'm new in the production thing and heard this name for the first time.... So i'm not able to understand what are they actually.. Komplete and Kontact... They are more than 300 GB plus the cost is also very high and i'm not sure if i should put my money on these..
What are they basically and how will they benefit me? Any good answer please? i googled but couldn't find any answer on my query so... Sorry if it sounds dumb question.. i'm learning production by my own so it's not easy every time

Thanks