What’s a particle on grammar? Please help me lol

In grammar, the term particle (abbreviated PTCL) has a traditional meaning, as a part of speech that cannot be inflected, and a modern meaning, as a function word associated with another word or phrase to impart meaning. ... Many languages use particles, in varying amounts and for varying reasons.

one of the main advantages of attending a large university is that you can often save money. smaller colleges are often private and charge higher tuition rates. a large public university can easily have 25,000 students or more taking classes on that campus. that higher number of students keep tuition costs down.