Articles are used in English to indicate whether a noun is specific or unspecific.
The definite article "the" indicates that a noun is specific; for example, "the apple" refers to one particular apple.
The indefinite article "a/an" suggests that the noun is unspecific, so "an apple" could refer to any apple out there.
It's important to be aware of when you should use articles and when you can omit them entirely to achieve.
For instance, when talking about something for the first time in a sentence, use "a/an" before it. Similarly, if you are referring to an event or activity that happens regularly, you don't need an article: "I go running every morning."
On the other hand, if you're referring to one particular event in the past or future, you should use "the": “I went to the park last week.”