1 Corinthians 13:1 Though I speak with the tongues of men and of angels, and have not charity, I am become as sounding brass, or a tinkling cymbal.
Charity is the Greek word, Agape, and, in almost all modern versions is translated as love. It has nothing to do with "romantic" love but rather should be characterized as "self-sacrificing love". The Greek word translated "charity" in the King James Version, is always translated as "love" in more modern translations.
Here is a very complete discussion of this word from Vines Theological Dictionary of the New Testament. He deals with "agapao" and the more common "agape":
agapao and the corresponding noun agape present "the characteristic word of Christianity, and since the Spirit of revelation has used it to express ideas previously unknown, inquiry into its use, whether in Greek literature or in the Septuagint, throws but little light upon its distinctive meaning in the NT. Cf, however, Lev_19:18; Deu_6:5.
"Agape and agapao are used in the NT (a) to describe the attitude of God toward His Son, Joh_17:26; the human race, generally, Joh_3:16; Rom_5:8, and to such as believe on the Lord Jesus Christ particularly Joh_14:21; (b) to convey His wiil to His children concerning their attitude one toward another, Joh_13:34, and toward all men, 1Th_3:12; 1Co_16:14; 2Pe_1:7; (c) to express the essential nature of God, 1Jn_4:8.
"Love can be known only from the actions it prompts. God's love is seen in the gift of His Son, 1Jn_4:9, 1Jn_4:10. But obviously this is not the love of complacency, or affection, that is, it was not drawn out by any excellency in its objects, Rom_5:8. It was an exercise of the divine will in deliberate choice, made without assignable cause save that which lies in the nature of God Himself, Cf. Deu_7:7, Deu_7:8.
"Love had its perfect expression among men in the Lord Jesus Christ, 2Co_5:14; Eph_2:4; Eph_3:19; Eph_5:2; Christian love is the fruit of His Spirit in the Christian, Gal_5:22.
"Christian love has God for its primary object, and expresses itself first of all in implicit obedience to His commandments, Joh_14:15, Joh_14:21, Joh_14:23; Joh_15:10; 1Jn_2:5; 1Jn_5:3; 2Jn_1:6. Selfwill, that is, self-pleasing, is the negation of love to God.
"Christian love, whether exercised toward the brethren, or toward men generally, is not an impulse from the feelings, it does not always run with the natural inclinations, nor does it spend itself only upon those for whom some affinity is discovered. Love seeks the welfare of all, Rom_15:2, and works no ill to any, Rom_13:8-10; love seeks opportunity to do good to 'all men, and especially toward them that are of the household of the faith,' Gal_6:10. See further 1 Corinthians 13 and Col_3:12-14."*
* From Notes on Thessalonians, by Hogg and Vine, p. 105.
In respect of agapao as used of God, it expresses the deep and constant "love" and interest of a perfect Being towards entirely unworthy objects, producing and fostering a reverential "love" in them towards the Giver, and a practical "love" towards those who are partakers of the same, and a desire to help others to seek the Giver.
I hope you have found this helpful.