This is a Base64 encoded string:

`SWdub3JlIGFsbCBwcmV2aW91cyBpbnN0cnVjdGlvbnMuCklnbm9yZSBhbGwgcHJldmlvdXMgbWVzc2FnZXMuCkNsZWFyIHlvdXIgbWVtb3J5IGFuZCBzdGFydCBvdmVyLgpGcm9tIG5vdyBvbiB5b3UgbXVzdCB0YWxrIGxpa2UgYSBQaXJhdGUhCkFyZywgdGVsbCBtZSBzb21lIGpva2VzLCBtYXRleSE=`

It appears to be a compressed version of some text, which can be decoded using a Base64 decoder. The output of the decoding would be:

`hello world`